400115375 has 16 divisors (see below), whose sum is σ = 544740768. Its totient is φ = 290992000.

The previous prime is 400115363. The next prime is 400115377. The reversal of 400115375 is 573511004.

It is not a de Polignac number, because 400115375 - 2²⁰ = 399066799 is a prime.

It is a super-2 number, since 2×400115375² = 320184626622781250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400115377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144122 + ... + 146871.

It is an arithmetic number, because the mean of its divisors is an integer number (34046298).

Almost surely, 2^400115375 is an apocalyptic number.

400115375 is a deficient number, since it is larger than the sum of its proper divisors (144625393).

400115375 is a wasteful number, since it uses less digits than its factorization.

400115375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291019 (or 291009 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 400115375 is about 20002.8841670395. The cubic root of 400115375 is about 736.8771337738.

Adding to 400115375 its reverse (573511004), we get a palindrome (973626379).

The spelling of 400115375 in words is "four hundred million, one hundred fifteen thousand, three hundred seventy-five".