400252520 has 16 divisors (see below), whose sum is σ = 900568260. Its totient is φ = 160100992.

The previous prime is 400252507. The next prime is 400252547. The reversal of 400252520 is 25252004.

It can be written as a sum of positive squares in 2 ways, for example, as 399280324 + 972196 = 19982^2 + 986^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 400252492 and 400252501.

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, 5003117 + ... + 5003196.

Almost surely, 2^400252520 is an apocalyptic number.

400252520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400252520 is an abundant number, since it is smaller than the sum of its proper divisors (500315740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400252520 is a wasteful number, since it uses less digits than its factorization.

400252520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10006324 (or 10006320 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 400252520 is about 20006.3120039651. The cubic root of 400252520 is about 736.9613157178.

The spelling of 400252520 in words is "four hundred million, two hundred fifty-two thousand, five hundred twenty".