400445131 has 4 divisors (see below), whose sum is σ = 406421992. Its totient is φ = 394468272.

The previous prime is 400445119. The next prime is 400445161. The reversal of 400445131 is 131544004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400445131 - 2²¹ = 398347979 is a prime.

It is a super-2 number, since 2×400445131² = 320712605883214322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400445161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2988330 + ... + 2988463.

It is an arithmetic number, because the mean of its divisors is an integer number (101605498).

Almost surely, 2^400445131 is an apocalyptic number.

400445131 is a deficient number, since it is larger than the sum of its proper divisors (5976861).

400445131 is an equidigital number, since it uses as much as digits as its factorization.

400445131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5976860.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 400445131 is about 20011.1251807588. The cubic root of 400445131 is about 737.0795111782.

Adding to 400445131 its reverse (131544004), we get a palindrome (531989135).

The spelling of 400445131 in words is "four hundred million, four hundred forty-five thousand, one hundred thirty-one".