749747421 has 20 divisors (see below), whose sum is σ = 1128827392. Its totient is φ = 495889128.

The previous prime is 749747419. The next prime is 749747437. The reversal of 749747421 is 124747947.

749747421 is a `hidden beast` number, since 74 + 97 + 474 + 21 = 666.

It is not a de Polignac number, because 749747421 - 2¹ = 749747419 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 (749747461) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 26155 + ... + 46728.

Almost surely, 2^749747421 is an apocalyptic number.

It is an amenable number.

749747421 is a deficient number, since it is larger than the sum of its proper divisors (379079971).

749747421 is a wasteful number, since it uses less digits than its factorization.

749747421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73022 (or 73013 counting only the distinct ones).

The product of its digits is 395136, while the sum is 45.

The square root of 749747421 is about 27381.5160464135. The cubic root of 749747421 is about 908.4582924085.

The spelling of 749747421 in words is "seven hundred forty-nine million, seven hundred forty-seven thousand, four hundred twenty-one".