400502231 has 2 divisors, whose sum is σ = 400502232. Its totient is φ = 400502230.

The previous prime is 400502191. The next prime is 400502287. The reversal of 400502231 is 132205004.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400502231 is a prime.

It is a super-2 number, since 2×400502231² = 320804074071954722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400502131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200251115 + 200251116.

It is an arithmetic number, because the mean of its divisors is an integer number (200251116).

Almost surely, 2^400502231 is an apocalyptic number.

400502231 is a deficient number, since it is larger than the sum of its proper divisors (1).

400502231 is an equidigital number, since it uses as much as digits as its factorization.

400502231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 400502231 is about 20012.5518362851. The cubic root of 400502231 is about 737.1145432268.

Adding to 400502231 its reverse (132205004), we get a palindrome (532707235).

The spelling of 400502231 in words is "four hundred million, five hundred two thousand, two hundred thirty-one".