400387770 has 48 divisors (see below), whose sum is σ = 1042835040. Its totient is φ = 106582752.

The previous prime is 400387769. The next prime is 400387777. The reversal of 400387770 is 77783004.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (400387777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52117 + ... + 59303.

It is an arithmetic number, because the mean of its divisors is an integer number (21725730).

Almost surely, 2^400387770 is an apocalyptic number.

400387770 is an abundant number, since it is smaller than the sum of its proper divisors (642447270).

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

400387770 is a wasteful number, since it uses less digits than its factorization.

400387770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7819 (or 7816 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 36.

The square root of 400387770 is about 20009.6919016760. The cubic root of 400387770 is about 737.0443156475.

The spelling of 400387770 in words is "four hundred million, three hundred eighty-seven thousand, seven hundred seventy".