400313515 has 16 divisors (see below), whose sum is σ = 550453248. Its totient is φ = 273774816.

The previous prime is 400313449. The next prime is 400313519. The reversal of 400313515 is 515313004.

It is a happy number.

It is not a de Polignac number, because 400313515 - 2¹⁷ = 400182443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400313519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1527 + ... + 28336.

It is an arithmetic number, because the mean of its divisors is an integer number (34403328).

Almost surely, 2^400313515 is an apocalyptic number.

400313515 is a deficient number, since it is larger than the sum of its proper divisors (150139733).

400313515 is a wasteful number, since it uses less digits than its factorization.

400313515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30258.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 400313515 is about 20007.8363397945. The cubic root of 400313515 is about 736.9987493129.

Adding to 400313515 its reverse (515313004), we get a palindrome (915626519).

The spelling of 400313515 in words is "four hundred million, three hundred thirteen thousand, five hundred fifteen".