749542939 has 4 divisors (see below), whose sum is σ = 751148424. Its totient is φ = 747937456.

The previous prime is 749542919. The next prime is 749542943. The reversal of 749542939 is 939245947.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 939245947 = 43 ⋅21842929.

It is a cyclic number.

It is not a de Polignac number, because 749542939 - 2¹⁵ = 749510171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (749542919) 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, 802042 + ... + 802975.

It is an arithmetic number, because the mean of its divisors is an integer number (187787106).

Almost surely, 2^749542939 is an apocalyptic number.

749542939 is a deficient number, since it is larger than the sum of its proper divisors (1605485).

749542939 is a wasteful number, since it uses less digits than its factorization.

749542939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605484.

The product of its digits is 2449440, while the sum is 52.

The square root of 749542939 is about 27377.7818495217. The cubic root of 749542939 is about 908.3756955881.

The spelling of 749542939 in words is "seven hundred forty-nine million, five hundred forty-two thousand, nine hundred thirty-nine".