402949391 has 4 divisors (see below), whose sum is σ = 433945512. Its totient is φ = 371953272.

The previous prime is 402949387. The next prime is 402949399. The reversal of 402949391 is 193949204.

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 402949391 - 2² = 402949387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402949399) 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, 15498041 + ... + 15498066.

It is an arithmetic number, because the mean of its divisors is an integer number (108486378).

Almost surely, 2^402949391 is an apocalyptic number.

402949391 is a deficient number, since it is larger than the sum of its proper divisors (30996121).

402949391 is a wasteful number, since it uses less digits than its factorization.

402949391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30996120.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 402949391 is about 20073.5993533796. The cubic root of 402949391 is about 738.6128084505.

The spelling of 402949391 in words is "four hundred two million, nine hundred forty-nine thousand, three hundred ninety-one".