2166401039 has 8 divisors (see below), whose sum is σ = 2363774160. Its totient is φ = 1969099200.

The previous prime is 2166400997. The next prime is 2166401047. The reversal of 2166401039 is 9301046612.

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 2166401039 - 2²⁴ = 2149623823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2166400996 and 2166401014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166401089) 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, 60857 + ... + 89645.

It is an arithmetic number, because the mean of its divisors is an integer number (295471770).

Almost surely, 2^2166401039 is an apocalyptic number.

2166401039 is a deficient number, since it is larger than the sum of its proper divisors (197373121).

2166401039 is a wasteful number, since it uses less digits than its factorization.

2166401039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35641.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 2166401039 is about 46544.6134262602. The cubic root of 2166401039 is about 1293.9364640451.

The spelling of 2166401039 in words is "two billion, one hundred sixty-six million, four hundred one thousand, thirty-nine".