400122252 has 18 divisors (see below), whose sum is σ = 1011420228. Its totient is φ = 133374072.

The previous prime is 400122223. The next prime is 400122277. The reversal of 400122252 is 252221004.

400122252 is a `hidden beast` number, since 400 + 12 + 2 + 252 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5557218 + ... + 5557289.

Almost surely, 2^400122252 is an apocalyptic number.

It is an amenable number.

400122252 is an abundant number, since it is smaller than the sum of its proper divisors (611297976).

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

400122252 is a wasteful number, since it uses less digits than its factorization.

400122252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11114517 (or 11114512 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 400122252 is about 20003.0560665114. The cubic root of 400122252 is about 736.8813554520.

Adding to 400122252 its reverse (252221004), we get a palindrome (652343256).

The spelling of 400122252 in words is "four hundred million, one hundred twenty-two thousand, two hundred fifty-two".