149618389 has 4 divisors (see below), whose sum is σ = 153267660. Its totient is φ = 145969120.

The previous prime is 149618383. The next prime is 149618449. The reversal of 149618389 is 983816941.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4223025 + 145395364 = 2055^2 + 12058^2 .

It is a cyclic number.

It is not a de Polignac number, because 149618389 - 2⁹ = 149617877 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149618383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1824574 + ... + 1824655.

It is an arithmetic number, because the mean of its divisors is an integer number (38316915).

Almost surely, 2^149618389 is an apocalyptic number.

It is an amenable number.

149618389 is a deficient number, since it is larger than the sum of its proper divisors (3649271).

149618389 is an equidigital number, since it uses as much as digits as its factorization.

149618389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3649270.

The product of its digits is 373248, while the sum is 49.

The square root of 149618389 is about 12231.8595887952. The cubic root of 149618389 is about 530.8783217259.

The spelling of 149618389 in words is "one hundred forty-nine million, six hundred eighteen thousand, three hundred eighty-nine".