402321031 has 32 divisors (see below), whose sum is σ = 510848640. Its totient is φ = 308883456.

The previous prime is 402321013. The next prime is 402321053. The reversal of 402321031 is 130123204.

It is a happy number.

It is not a de Polignac number, because 402321031 - 2⁵ = 402320999 is a prime.

It is a super-2 number, since 2×402321031² = 323724423969805922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 402320996 and 402321014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402321011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251125 + ... + 252721.

It is an arithmetic number, because the mean of its divisors is an integer number (15964020).

Almost surely, 2^402321031 is an apocalyptic number.

402321031 is a deficient number, since it is larger than the sum of its proper divisors (108527609).

402321031 is a wasteful number, since it uses less digits than its factorization.

402321031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 402321031 is about 20057.9418435691. The cubic root of 402321031 is about 738.2286773321.

Adding to 402321031 its reverse (130123204), we get a palindrome (532444235).

The spelling of 402321031 in words is "four hundred two million, three hundred twenty-one thousand, thirty-one".