400223131 has 24 divisors (see below), whose sum is σ = 509084784. Its totient is φ = 311129280.

The previous prime is 400223111. The next prime is 400223141. The reversal of 400223131 is 131322004.

It is a happy number.

It is not a de Polignac number, because 400223131 - 2²¹ = 398125979 is a prime.

It is a super-2 number, since 2×400223131² = 320357109174886322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400223111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 394581 + ... + 395593.

It is an arithmetic number, because the mean of its divisors is an integer number (21211866).

Almost surely, 2^400223131 is an apocalyptic number.

400223131 is a deficient number, since it is larger than the sum of its proper divisors (108861653).

400223131 is a wasteful number, since it uses less digits than its factorization.

400223131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771 (or 1764 counting only the distinct ones).

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

The square root of 400223131 is about 20005.5774972881. The cubic root of 400223131 is about 736.9432778666.

Adding to 400223131 its reverse (131322004), we get a palindrome (531545135).

The spelling of 400223131 in words is "four hundred million, two hundred twenty-three thousand, one hundred thirty-one".