400055680 has 32 divisors (see below), whose sum is σ = 956384640. Its totient is φ = 160022016.

The previous prime is 400055569. The next prime is 400055683. The reversal of 400055680 is 86550004.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400055683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311904 + ... + 313183.

It is an arithmetic number, because the mean of its divisors is an integer number (29887020).

Almost surely, 2^400055680 is an apocalyptic number.

400055680 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400055680 is an abundant number, since it is smaller than the sum of its proper divisors (556328960).

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

400055680 is an equidigital number, since it uses as much as digits as its factorization.

400055680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625106 (or 625094 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 400055680 is about 20001.3919515618. The cubic root of 400055680 is about 736.8404859542.

The spelling of 400055680 in words is "four hundred million, fifty-five thousand, six hundred eighty".