400685280 has 48 divisors (see below), whose sum is σ = 1262160144. Its totient is φ = 106849280.

The previous prime is 400685279. The next prime is 400685297. The reversal of 400685280 is 82586004.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416901 + ... + 417860.

It is an arithmetic number, because the mean of its divisors is an integer number (26295003).

Almost surely, 2^400685280 is an apocalyptic number.

400685280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400685280 is an abundant number, since it is smaller than the sum of its proper divisors (861474864).

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

400685280 is a wasteful number, since it uses less digits than its factorization.

400685280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834779 (or 834771 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 400685280 is about 20017.1246686431. The cubic root of 400685280 is about 737.2268251889.

The spelling of 400685280 in words is "four hundred million, six hundred eighty-five thousand, two hundred eighty".