749137921 has 24 divisors (see below), whose sum is σ = 890239680. Its totient is φ = 628401312.

The previous prime is 749137901. The next prime is 749137933. The reversal of 749137921 is 129731947.

It is a happy number.

It is not a de Polignac number, because 749137921 - 2²⁹ = 212267009 is a prime.

It is a super-2 number, since 2×749137921² = 1122415249360404482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (749137901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 567300 + ... + 568618.

It is an arithmetic number, because the mean of its divisors is an integer number (37093320).

Almost surely, 2^749137921 is an apocalyptic number.

It is an amenable number.

749137921 is a deficient number, since it is larger than the sum of its proper divisors (141101759).

749137921 is a wasteful number, since it uses less digits than its factorization.

749137921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573 (or 1566 counting only the distinct ones).

The product of its digits is 95256, while the sum is 43.

The square root of 749137921 is about 27370.3840126513. The cubic root of 749137921 is about 908.2120515080.

The spelling of 749137921 in words is "seven hundred forty-nine million, one hundred thirty-seven thousand, nine hundred twenty-one".