40173990 has 64 divisors (see below), whose sum is σ = 101511360. Its totient is φ = 10160640.

The previous prime is 40173967. The next prime is 40174007. The reversal of 40173990 is 9937104.

It is a super-2 number, since 2×40173990² = 3227898945040200, which 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 31 ways as a sum of consecutive naturals, for example, 52692 + ... + 53448.

It is an arithmetic number, because the mean of its divisors is an integer number (1586115).

Almost surely, 2^40173990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40173990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50755680).

40173990 is an abundant number, since it is smaller than the sum of its proper divisors (61337370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40173990 is a wasteful number, since it uses less digits than its factorization.

40173990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 40173990 is about 6338.2955122020. The cubic root of 40173990 is about 342.4903366304.

The spelling of 40173990 in words is "forty million, one hundred seventy-three thousand, nine hundred ninety".