402819397 has 2 divisors, whose sum is σ = 402819398. Its totient is φ = 402819396.

The previous prime is 402819353. The next prime is 402819409. The reversal of 402819397 is 793918204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 365536161 + 37283236 = 19119^2 + 6106^2 .

It is a cyclic number.

It is not a de Polignac number, because 402819397 - 2⁷ = 402819269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402849397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201409698 + 201409699.

It is an arithmetic number, because the mean of its divisors is an integer number (201409699).

Almost surely, 2^402819397 is an apocalyptic number.

It is an amenable number.

402819397 is a deficient number, since it is larger than the sum of its proper divisors (1).

402819397 is an equidigital number, since it uses as much as digits as its factorization.

402819397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 402819397 is about 20070.3611576872. The cubic root of 402819397 is about 738.5333728667.

The spelling of 402819397 in words is "four hundred two million, eight hundred nineteen thousand, three hundred ninety-seven".