400636417639 has 8 divisors (see below), whose sum is σ = 402982233552. Its totient is φ = 398290946880.

The previous prime is 400636417637. The next prime is 400636417669. The reversal of 400636417639 is 936714636004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400636417639 - 2¹ = 400636417637 is a prime.

It is a super-2 number, since 2×400636417639² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400636417592 and 400636417601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400636417631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2461299 + ... + 2619019.

It is an arithmetic number, because the mean of its divisors is an integer number (50372779194).

Almost surely, 2^400636417639 is an apocalyptic number.

400636417639 is a deficient number, since it is larger than the sum of its proper divisors (2345815913).

400636417639 is a wasteful number, since it uses less digits than its factorization.

400636417639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172577.

The product of its (nonzero) digits is 1959552, while the sum is 49.

The spelling of 400636417639 in words is "four hundred billion, six hundred thirty-six million, four hundred seventeen thousand, six hundred thirty-nine".