40172997838 has 16 divisors (see below), whose sum is σ = 60482691360. Its totient is φ = 20012230656.

The previous prime is 40172997829. The next prime is 40172997883. The reversal of 40172997838 is 83879927104.

It is a super-2 number, since 2×40172997838² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 597678 + ... + 661486.

It is an arithmetic number, because the mean of its divisors is an integer number (3780168210).

Almost surely, 2^40172997838 is an apocalyptic number.

40172997838 is a deficient number, since it is larger than the sum of its proper divisors (20309693522).

40172997838 is a wasteful number, since it uses less digits than its factorization.

40172997838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64971.

The product of its (nonzero) digits is 6096384, while the sum is 58.

The spelling of 40172997838 in words is "forty billion, one hundred seventy-two million, nine hundred ninety-seven thousand, eight hundred thirty-eight".