154386989 has 4 divisors (see below), whose sum is σ = 162512640. Its totient is φ = 146261340.

The previous prime is 154386941. The next prime is 154387007. The reversal of 154386989 is 989683451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 989683451 = 83 ⋅11923897.

It is a cyclic number.

It is not a de Polignac number, because 154386989 - 2²⁰ = 153338413 is a prime.

It is a super-2 number, since 2×154386989² = 47670684744972242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 154386989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154386919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4062797 + ... + 4062834.

It is an arithmetic number, because the mean of its divisors is an integer number (40628160).

Almost surely, 2^154386989 is an apocalyptic number.

154386989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

154386989 is a deficient number, since it is larger than the sum of its proper divisors (8125651).

154386989 is an equidigital number, since it uses as much as digits as its factorization.

154386989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8125650.

The product of its digits is 1866240, while the sum is 53.

The square root of 154386989 is about 12425.2560939403. The cubic root of 154386989 is about 536.4594488670.

The spelling of 154386989 in words is "one hundred fifty-four million, three hundred eighty-six thousand, nine hundred eighty-nine".