400052121 has 12 divisors (see below), whose sum is σ = 620489232. Its totient is φ = 228601128.

The previous prime is 400052119. The next prime is 400052161. The reversal of 400052121 is 121250004.

It is not a de Polignac number, because 400052121 - 2¹ = 400052119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400052121.

It is not an unprimeable number, because it can be changed into a prime (400052101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1360575 + ... + 1360868.

It is an arithmetic number, because the mean of its divisors is an integer number (51707436).

Almost surely, 2^400052121 is an apocalyptic number.

It is an amenable number.

400052121 is a deficient number, since it is larger than the sum of its proper divisors (220437111).

400052121 is a wasteful number, since it uses less digits than its factorization.

400052121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2721460 (or 2721453 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 400052121 is about 20001.3029825559. The cubic root of 400052121 is about 736.8383009058.

The spelling of 400052121 in words is "four hundred million, fifty-two thousand, one hundred twenty-one".