400312620 has 72 divisors (see below), whose sum is σ = 1247120784. Its totient is φ = 103863168.

The previous prime is 400312589. The next prime is 400312639. The reversal of 400312620 is 26213004.

It is a happy number.

400312620 is a `hidden beast` number, since 40 + 0 + 3 + 1 + 2 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 400312593 and 400312602.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23394 + ... + 36713.

It is an arithmetic number, because the mean of its divisors is an integer number (17321122).

Almost surely, 2^400312620 is an apocalyptic number.

It is an amenable number.

400312620 is an abundant number, since it is smaller than the sum of its proper divisors (846808164).

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

400312620 is a wasteful number, since it uses less digits than its factorization.

400312620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60159 (or 60154 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 400312620 is about 20007.8139735454. The cubic root of 400312620 is about 736.9982000647.

Adding to 400312620 its reverse (26213004), we get a palindrome (426525624).

The spelling of 400312620 in words is "four hundred million, three hundred twelve thousand, six hundred twenty".