402431 has 4 divisors (see below), whose sum is σ = 419952. Its totient is φ = 384912.

The previous prime is 402419. The next prime is 402443. The reversal of 402431 is 134204.

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

It is an interprime number because it is at equal distance from previous prime (402419) and next prime (402443).

It is a cyclic number.

It is not a de Polignac number, because 402431 - 2¹⁰ = 401407 is a prime.

It is a super-2 number, since 2×402431² = 323901419522, which contains 22 as substring.

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 (402131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8726 + ... + 8771.

It is an arithmetic number, because the mean of its divisors is an integer number (104988).

2⁴⁰²⁴³¹ is an apocalyptic number.

402431 is a deficient number, since it is larger than the sum of its proper divisors (17521).

402431 is a wasteful number, since it uses less digits than its factorization.

402431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17520.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 402431 is about 634.3744950737. The cubic root of 402431 is about 73.8295932805.

Adding to 402431 its reverse (134204), we get a palindrome (536635).

The spelling of 402431 in words is "four hundred two thousand, four hundred thirty-one".