402798091 has 4 divisors (see below), whose sum is σ = 402867000. Its totient is φ = 402729184.

The previous prime is 402798073. The next prime is 402798113. The reversal of 402798091 is 190897204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402798091 - 2¹⁵ = 402765323 is a prime.

It is a super-2 number, since 2×402798091² = 324492604226488562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402798031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24781 + ... + 37678.

It is an arithmetic number, because the mean of its divisors is an integer number (100716750).

Almost surely, 2^402798091 is an apocalyptic number.

402798091 is a deficient number, since it is larger than the sum of its proper divisors (68909).

402798091 is an equidigital number, since it uses as much as digits as its factorization.

402798091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68908.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 402798091 is about 20069.8303679927. The cubic root of 402798091 is about 738.5203517547.

The spelling of 402798091 in words is "four hundred two million, seven hundred ninety-eight thousand, ninety-one".