400531402 has 8 divisors (see below), whose sum is σ = 602693316. Its totient is φ = 199633632.

The previous prime is 400531367. The next prime is 400531403. The reversal of 400531402 is 204135004.

It can be written as a sum of positive squares in 2 ways, for example, as 400040001 + 491401 = 20001^2 + 701^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 400531402.

It is not an unprimeable number, because it can be changed into a prime (400531403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315243 + ... + 316510.

Almost surely, 2^400531402 is an apocalyptic number.

400531402 is a deficient number, since it is larger than the sum of its proper divisors (202161914).

400531402 is a wasteful number, since it uses less digits than its factorization.

400531402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632072.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 400531402 is about 20013.2806406146. The cubic root of 400531402 is about 737.1324389626.

Adding to 400531402 its reverse (204135004), we get a palindrome (604666406).

The spelling of 400531402 in words is "four hundred million, five hundred thirty-one thousand, four hundred two".