402023431 has 4 divisors (see below), whose sum is σ = 402063912. Its totient is φ = 401982952.

The previous prime is 402023393. The next prime is 402023449. The reversal of 402023431 is 134320204.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 402023431 - 2¹⁹ = 401499143 is a prime.

It is a super-2 number, since 2×402023431² = 323245678146023522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402023399 and 402023408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402026431) 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, 5976 + ... + 28978.

It is an arithmetic number, because the mean of its divisors is an integer number (100515978).

Almost surely, 2^402023431 is an apocalyptic number.

402023431 is a deficient number, since it is larger than the sum of its proper divisors (40481).

402023431 is a wasteful number, since it uses less digits than its factorization.

402023431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40480.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 402023431 is about 20050.5219632807. The cubic root of 402023431 is about 738.0466079313.

Adding to 402023431 its reverse (134320204), we get a palindrome (536343635).

The spelling of 402023431 in words is "four hundred two million, twenty-three thousand, four hundred thirty-one".