402397 has 4 divisors (see below), whose sum is σ = 403900. Its totient is φ = 400896.

The previous prime is 402383. The next prime is 402403. The reversal of 402397 is 793204.

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

It can be written as a sum of positive squares in 2 ways, for example, as 306916 + 95481 = 554^2 + 309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402397 is a prime.

It is an Ulam number.

It is a Duffinian number.

402397 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228 + ... + 925.

It is an arithmetic number, because the mean of its divisors is an integer number (100975).

2⁴⁰²³⁹⁷ is an apocalyptic number.

It is an amenable number.

402397 is a deficient number, since it is larger than the sum of its proper divisors (1503).

402397 is a wasteful number, since it uses less digits than its factorization.

402397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 402397 is about 634.3476964568. The cubic root of 402397 is about 73.8275140198.

The spelling of 402397 in words is "four hundred two thousand, three hundred ninety-seven".