400861621013 has 16 divisors (see below), whose sum is σ = 478769500416. Its totient is φ = 328159434240.

The previous prime is 400861621003. The next prime is 400861621019. The reversal of 400861621013 is 310126168004.

It is a cyclic number.

It is not a de Polignac number, because 400861621013 - 2¹⁶ = 400861555477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400861621019) 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, 1776956 + ... + 1989797.

It is an arithmetic number, because the mean of its divisors is an integer number (29923093776).

Almost surely, 2^400861621013 is an apocalyptic number.

It is an amenable number.

400861621013 is a deficient number, since it is larger than the sum of its proper divisors (77907879403).

400861621013 is a wasteful number, since it uses less digits than its factorization.

400861621013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3767444.

The product of its (nonzero) digits is 6912, while the sum is 32.

Adding to 400861621013 its reverse (310126168004), we get a palindrome (710987789017).

The spelling of 400861621013 in words is "four hundred billion, eight hundred sixty-one million, six hundred twenty-one thousand, thirteen".