400076728 has 16 divisors (see below), whose sum is σ = 750362760. Its totient is φ = 199980000.

The previous prime is 400076707. The next prime is 400076753. The reversal of 400076728 is 827670004.

It is a super-2 number, since 2×400076728² = 320122776574371968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 400076693 and 400076702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39463 + ... + 48553.

Almost surely, 2^400076728 is an apocalyptic number.

It is an amenable number.

400076728 is a deficient number, since it is larger than the sum of its proper divisors (350286032).

400076728 is a wasteful number, since it uses less digits than its factorization.

400076728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14598 (or 14594 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 400076728 is about 20001.9181080215. The cubic root of 400076728 is about 736.8534081109.

The spelling of 400076728 in words is "four hundred million, seventy-six thousand, seven hundred twenty-eight".