400977725 has 12 divisors (see below), whose sum is σ = 526460724. Its totient is φ = 301912320.

The previous prime is 400977719. The next prime is 400977743. The reversal of 400977725 is 527779004.

It can be written as a sum of positive squares in 6 ways, for example, as 6280036 + 394697689 = 2506^2 + 19867^2 .

It is not a de Polignac number, because 400977725 - 2¹⁰ = 400976701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 471314 + ... + 472163.

It is an arithmetic number, because the mean of its divisors is an integer number (43871727).

Almost surely, 2^400977725 is an apocalyptic number.

It is an amenable number.

400977725 is a deficient number, since it is larger than the sum of its proper divisors (125482999).

400977725 is a wasteful number, since it uses less digits than its factorization.

400977725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943504 (or 943499 counting only the distinct ones).

The product of its (nonzero) digits is 123480, while the sum is 41.

The square root of 400977725 is about 20024.4282065681. The cubic root of 400977725 is about 737.4061395441.

The spelling of 400977725 in words is "four hundred million, nine hundred seventy-seven thousand, seven hundred twenty-five".