400400231 has 16 divisors (see below), whose sum is σ = 504817920. Its totient is φ = 308489280.

The previous prime is 400400131. The next prime is 400400237. The reversal of 400400231 is 132004004.

It is a de Polignac number, because none of the positive numbers 2^k-400400231 is a prime.

It is a super-2 number, since 2×400400231² = 320640689969706722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400400237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22361 + ... + 36066.

It is an arithmetic number, because the mean of its divisors is an integer number (31551120).

Almost surely, 2^400400231 is an apocalyptic number.

400400231 is a deficient number, since it is larger than the sum of its proper divisors (104417689).

400400231 is a wasteful number, since it uses less digits than its factorization.

400400231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58534.

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

The square root of 400400231 is about 20010.0032733631. The cubic root of 400400231 is about 737.0519617468.

Adding to 400400231 its reverse (132004004), we get a palindrome (532404235).

The spelling of 400400231 in words is "four hundred million, four hundred thousand, two hundred thirty-one".