149973887 has 4 divisors (see below), whose sum is σ = 171398736. Its totient is φ = 128549040.

The previous prime is 149973883. The next prime is 149973899. The reversal of 149973887 is 788379941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788379941 = 31 ⋅25431611.

It is a cyclic number.

It is not a de Polignac number, because 149973887 - 2² = 149973883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149973883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10712414 + ... + 10712427.

It is an arithmetic number, because the mean of its divisors is an integer number (42849684).

Almost surely, 2^149973887 is an apocalyptic number.

149973887 is a deficient number, since it is larger than the sum of its proper divisors (21424849).

149973887 is an equidigital number, since it uses as much as digits as its factorization.

149973887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21424848.

The product of its digits is 3048192, while the sum is 56.

The square root of 149973887 is about 12246.3826087543. The cubic root of 149973887 is about 531.2984503539.

The spelling of 149973887 in words is "one hundred forty-nine million, nine hundred seventy-three thousand, eight hundred eighty-seven".