721436404 has 24 divisors (see below), whose sum is σ = 1361386208. Its totient is φ = 332540640.

The previous prime is 721436399. The next prime is 721436407. The reversal of 721436404 is 404634127.

It is a super-3 number, since 3×721436404³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721436407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33619 + ... + 50725.

Almost surely, 2^721436404 is an apocalyptic number.

It is an amenable number.

721436404 is a deficient number, since it is larger than the sum of its proper divisors (639949804).

721436404 is a wasteful number, since it uses less digits than its factorization.

721436404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17935 (or 17933 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 721436404 is about 26859.5682020393. The cubic root of 721436404 is about 896.8765818812.

The spelling of 721436404 in words is "seven hundred twenty-one million, four hundred thirty-six thousand, four hundred four".