396937921 has 2 divisors, whose sum is σ = 396937922. Its totient is φ = 396937920.

The previous prime is 396937907. The next prime is 396937943. The reversal of 396937921 is 129739693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396447921 + 490000 = 19911^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 396937921 - 2¹⁵ = 396905153 is a prime.

It is not a weakly prime, because it can be changed into another prime (396937951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198468960 + 198468961.

It is an arithmetic number, because the mean of its divisors is an integer number (198468961).

Almost surely, 2^396937921 is an apocalyptic number.

It is an amenable number.

396937921 is a deficient number, since it is larger than the sum of its proper divisors (1).

396937921 is an equidigital number, since it uses as much as digits as its factorization.

396937921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 551124, while the sum is 49.

The square root of 396937921 is about 19923.3009564178. The cubic root of 396937921 is about 734.9213490431.

The spelling of 396937921 in words is "three hundred ninety-six million, nine hundred thirty-seven thousand, nine hundred twenty-one".