400631045 has 8 divisors (see below), whose sum is σ = 480927480. Its totient is φ = 320391360.

The previous prime is 400631029. The next prime is 400631047. The reversal of 400631045 is 540136004.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 51165409 + 349465636 = 7153^2 + 18694^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400631045 - 2⁴ = 400631029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400631045.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400631047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3311 + ... + 28499.

It is an arithmetic number, because the mean of its divisors is an integer number (60115935).

Almost surely, 2^400631045 is an apocalyptic number.

It is an amenable number.

400631045 is a deficient number, since it is larger than the sum of its proper divisors (80296435).

400631045 is a wasteful number, since it uses less digits than its factorization.

400631045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28375.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 400631045 is about 20015.7699077502. The cubic root of 400631045 is about 737.1935610928.

Adding to 400631045 its reverse (540136004), we get a palindrome (940767049).

The spelling of 400631045 in words is "four hundred million, six hundred thirty-one thousand, forty-five".