402937991 has 2 divisors, whose sum is σ = 402937992. Its totient is φ = 402937990.

The previous prime is 402937967. The next prime is 402938023. The reversal of 402937991 is 199739204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402937991 - 2¹⁰ = 402936967 is a prime.

It is a super-2 number, since 2×402937991² = 324718049182232162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402937291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201468995 + 201468996.

It is an arithmetic number, because the mean of its divisors is an integer number (201468996).

Almost surely, 2^402937991 is an apocalyptic number.

402937991 is a deficient number, since it is larger than the sum of its proper divisors (1).

402937991 is an equidigital number, since it uses as much as digits as its factorization.

402937991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 402937991 is about 20073.3153963166. The cubic root of 402937991 is about 738.6058429228.

It can be divided in two parts, 40293 and 7991, that added together give a palindrome (48284).

The spelling of 402937991 in words is "four hundred two million, nine hundred thirty-seven thousand, nine hundred ninety-one".