400108831 has 2 divisors, whose sum is σ = 400108832. Its totient is φ = 400108830.

The previous prime is 400108829. The next prime is 400108837. The reversal of 400108831 is 138801004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400108831 - 2¹ = 400108829 is a prime.

It is a super-2 number, since 2×400108831² = 320174153288373122, which contains 22 as substring.

Together with 400108829, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 400108796 and 400108805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400108837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200054415 + 200054416.

It is an arithmetic number, because the mean of its divisors is an integer number (200054416).

Almost surely, 2^400108831 is an apocalyptic number.

400108831 is a deficient number, since it is larger than the sum of its proper divisors (1).

400108831 is an equidigital number, since it uses as much as digits as its factorization.

400108831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 400108831 is about 20002.7205899598. The cubic root of 400108831 is about 736.8731164740.

Adding to 400108831 its reverse (138801004), we get a palindrome (538909835).

It can be divided in two parts, 40010 and 8831, that added together give a square (48841 = 221²).

The spelling of 400108831 in words is "four hundred million, one hundred eight thousand, eight hundred thirty-one".