400400715 has 96 divisors (see below), whose sum is σ = 770321664. Its totient is φ = 176017920.

The previous prime is 400400713. The next prime is 400400731. The reversal of 400400715 is 517004004.

It is not a de Polignac number, because 400400715 - 2¹ = 400400713 is a prime.

It is a super-2 number, since 2×400400715² = 320641465145022450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 400400691 and 400400700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400400713) 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 95 ways as a sum of consecutive naturals, for example, 2314369 + ... + 2314541.

It is an arithmetic number, because the mean of its divisors is an integer number (8024184).

Almost surely, 2^400400715 is an apocalyptic number.

400400715 is a deficient number, since it is larger than the sum of its proper divisors (369920949).

400400715 is a wasteful number, since it uses less digits than its factorization.

400400715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 400400715 is about 20010.0153673104. The cubic root of 400400715 is about 737.0522587271.

Adding to 400400715 its reverse (517004004), we get a palindrome (917404719).

The spelling of 400400715 in words is "four hundred million, four hundred thousand, seven hundred fifteen".