402397091 has 2 divisors, whose sum is σ = 402397092. Its totient is φ = 402397090.

The previous prime is 402397063. The next prime is 402397111. The reversal of 402397091 is 190793204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402397091 - 2⁶ = 402397027 is a prime.

It is not a weakly prime, because it can be changed into another prime (402397991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201198545 + 201198546.

It is an arithmetic number, because the mean of its divisors is an integer number (201198546).

Almost surely, 2^402397091 is an apocalyptic number.

402397091 is a deficient number, since it is larger than the sum of its proper divisors (1).

402397091 is an equidigital number, since it uses as much as digits as its factorization.

402397091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 402397091 is about 20059.8377610588. The cubic root of 402397091 is about 738.2751958508.

The spelling of 402397091 in words is "four hundred two million, three hundred ninety-seven thousand, ninety-one".