400189617 has 6 divisors (see below), whose sum is σ = 578051682. Its totient is φ = 266793072.

The previous prime is 400189607. The next prime is 400189661. The reversal of 400189617 is 716981004.

It can be written as a sum of positive squares in only one way, i.e., 324864576 + 75325041 = 18024^2 + 8679^2 .

It is not a de Polignac number, because 400189617 - 2¹¹ = 400187569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400189607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22232748 + ... + 22232765.

It is an arithmetic number, because the mean of its divisors is an integer number (96341947).

Almost surely, 2^400189617 is an apocalyptic number.

It is an amenable number.

400189617 is a deficient number, since it is larger than the sum of its proper divisors (177862065).

400189617 is a wasteful number, since it uses less digits than its factorization.

400189617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44465519 (or 44465516 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 400189617 is about 20004.7398633424. The cubic root of 400189617 is about 736.9227071694.

The spelling of 400189617 in words is "four hundred million, one hundred eighty-nine thousand, six hundred seventeen".