400621369 has 2 divisors, whose sum is σ = 400621370. Its totient is φ = 400621368.

The previous prime is 400621321. The next prime is 400621379. The reversal of 400621369 is 963126004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379782144 + 20839225 = 19488^2 + 4565^2 .

It is a cyclic number.

It is not a de Polignac number, because 400621369 - 2¹¹ = 400619321 is a prime.

It is a super-2 number, since 2×400621369² = 320994962598868322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400621369.

It is not a weakly prime, because it can be changed into another prime (400621379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200310684 + 200310685.

It is an arithmetic number, because the mean of its divisors is an integer number (200310685).

Almost surely, 2^400621369 is an apocalyptic number.

It is an amenable number.

400621369 is a deficient number, since it is larger than the sum of its proper divisors (1).

400621369 is an equidigital number, since it uses as much as digits as its factorization.

400621369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 400621369 is about 20015.5281968775. The cubic root of 400621369 is about 737.1876261705.

The spelling of 400621369 in words is "four hundred million, six hundred twenty-one thousand, three hundred sixty-nine".