400361440 has 24 divisors (see below), whose sum is σ = 945854280. Its totient is φ = 160144512.

The previous prime is 400361411. The next prime is 400361447. The reversal of 400361440 is 44163004.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400361447) 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, 1250970 + ... + 1251289.

It is an arithmetic number, because the mean of its divisors is an integer number (39410595).

Almost surely, 2^400361440 is an apocalyptic number.

400361440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400361440 is an abundant number, since it is smaller than the sum of its proper divisors (545492840).

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

400361440 is a wasteful number, since it uses less digits than its factorization.

400361440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2502274 (or 2502266 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 400361440 is about 20009.0339596893. The cubic root of 400361440 is about 737.0281589750.

The spelling of 400361440 in words is "four hundred million, three hundred sixty-one thousand, four hundred forty".