402117997 has 2 divisors, whose sum is σ = 402117998. Its totient is φ = 402117996.

The previous prime is 402117971. The next prime is 402118061. The reversal of 402117997 is 799711204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 370601001 + 31516996 = 19251^2 + 5614^2 .

It is a cyclic number.

It is not a de Polignac number, because 402117997 - 2⁷ = 402117869 is a prime.

It is a super-2 number, since 2×402117997² = 323397767022584018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402117497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201058998 + 201058999.

It is an arithmetic number, because the mean of its divisors is an integer number (201058999).

Almost surely, 2^402117997 is an apocalyptic number.

It is an amenable number.

402117997 is a deficient number, since it is larger than the sum of its proper divisors (1).

402117997 is an equidigital number, since it uses as much as digits as its factorization.

402117997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 402117997 is about 20052.8800175935. The cubic root of 402117997 is about 738.1044724225.

The spelling of 402117997 in words is "four hundred two million, one hundred seventeen thousand, nine hundred ninety-seven".