402997 has 4 divisors (see below), whose sum is σ = 460576. Its totient is φ = 345420.

The previous prime is 402991. The next prime is 403001. The reversal of 402997 is 799204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 402997 - 2⁷ = 402869 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402991) 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, 28779 + ... + 28792.

It is an arithmetic number, because the mean of its divisors is an integer number (115144).

2⁴⁰²⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

402997 is a deficient number, since it is larger than the sum of its proper divisors (57579).

402997 is an equidigital number, since it uses as much as digits as its factorization.

402997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57578.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 402997 is about 634.8204470557. The cubic root of 402997 is about 73.8641896663.

The spelling of 402997 in words is "four hundred two thousand, nine hundred ninety-seven".