402090491 has 8 divisors (see below), whose sum is σ = 452794368. Its totient is φ = 353745000.

The previous prime is 402090461. The next prime is 402090503. The reversal of 402090491 is 194090204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402090491 - 2¹⁴ = 402074107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402090431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 589235 + ... + 589916.

It is an arithmetic number, because the mean of its divisors is an integer number (56599296).

Almost surely, 2^402090491 is an apocalyptic number.

402090491 is a deficient number, since it is larger than the sum of its proper divisors (50703877).

402090491 is a wasteful number, since it uses less digits than its factorization.

402090491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179193.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 402090491 is about 20052.1941692175. The cubic root of 402090491 is about 738.0876425660.

The spelling of 402090491 in words is "four hundred two million, ninety thousand, four hundred ninety-one".