40173989 has 4 divisors (see below), whose sum is σ = 40225824. Its totient is φ = 40122156.

The previous prime is 40173967. The next prime is 40174007. The reversal of 40173989 is 98937104.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40173989 is a prime.

It is a super-2 number, since 2×40173989² = 3227898784344242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40173689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24737 + ... + 26310.

It is an arithmetic number, because the mean of its divisors is an integer number (10056456).

Almost surely, 2^40173989 is an apocalyptic number.

It is an amenable number.

40173989 is a deficient number, since it is larger than the sum of its proper divisors (51835).

40173989 is an equidigital number, since it uses as much as digits as its factorization.

40173989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51834.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 40173989 is about 6338.2954333164. The cubic root of 40173989 is about 342.4903337887.

The spelling of 40173989 in words is "forty million, one hundred seventy-three thousand, nine hundred eighty-nine".