149974639 has 4 divisors (see below), whose sum is σ = 150323040. Its totient is φ = 149626240.

The previous prime is 149974633. The next prime is 149974667. The reversal of 149974639 is 936479941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936479941 = 9433 ⋅99277.

It is a cyclic number.

It is not a de Polignac number, because 149974639 - 2⁷ = 149974511 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 (149974633) 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, 173554 + ... + 174415.

It is an arithmetic number, because the mean of its divisors is an integer number (37580760).

Almost surely, 2^149974639 is an apocalyptic number.

149974639 is a deficient number, since it is larger than the sum of its proper divisors (348401).

149974639 is an equidigital number, since it uses as much as digits as its factorization.

149974639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348400.

The product of its digits is 1469664, while the sum is 52.

The square root of 149974639 is about 12246.4133116599. The cubic root of 149974639 is about 531.2993383658.

The spelling of 149974639 in words is "one hundred forty-nine million, nine hundred seventy-four thousand, six hundred thirty-nine".