400540017 has 4 divisors (see below), whose sum is σ = 534053360. Its totient is φ = 267026676.

The previous prime is 400540013. The next prime is 400540031. The reversal of 400540017 is 710045004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 400540017 - 2² = 400540013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400539975 and 400540002.

It is not an unprimeable number, because it can be changed into a prime (400540013) 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, 66756667 + ... + 66756672.

It is an arithmetic number, because the mean of its divisors is an integer number (133513340).

Almost surely, 2^400540017 is an apocalyptic number.

It is an amenable number.

400540017 is a deficient number, since it is larger than the sum of its proper divisors (133513343).

400540017 is a wasteful number, since it uses less digits than its factorization.

400540017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133513342.

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

The square root of 400540017 is about 20013.4958715363. The cubic root of 400540017 is about 737.1377239002.

The spelling of 400540017 in words is "four hundred million, five hundred forty thousand, seventeen".