40172997789 has 64 divisors (see below), whose sum is σ = 64818247680. Its totient is φ = 24487971840.

The previous prime is 40172997773. The next prime is 40172997803. The reversal of 40172997789 is 98779927104.

40172997789 is a `hidden beast` number, since 401 + 72 + 9 + 97 + 78 + 9 = 666.

It is not a de Polignac number, because 40172997789 - 2⁴ = 40172997773 is a prime.

It is a super-2 number, since 2×40172997789² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40172997749) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14654959 + ... + 14657699.

It is an arithmetic number, because the mean of its divisors is an integer number (1012785120).

Almost surely, 2^40172997789 is an apocalyptic number.

It is an amenable number.

40172997789 is a deficient number, since it is larger than the sum of its proper divisors (24645249891).

40172997789 is a wasteful number, since it uses less digits than its factorization.

40172997789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3667 (or 3661 counting only the distinct ones).

The product of its (nonzero) digits is 16003008, while the sum is 63.

The spelling of 40172997789 in words is "forty billion, one hundred seventy-two million, nine hundred ninety-seven thousand, seven hundred eighty-nine".