40904189 has 4 divisors (see below), whose sum is σ = 42682656. Its totient is φ = 39125724.

The previous prime is 40904177. The next prime is 40904191. The reversal of 40904189 is 98140904.

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 not a de Polignac number, because 40904189 - 2⁴ = 40904173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40904119) 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, 889199 + ... + 889244.

It is an arithmetic number, because the mean of its divisors is an integer number (10670664).

Almost surely, 2^40904189 is an apocalyptic number.

It is an amenable number.

40904189 is a deficient number, since it is larger than the sum of its proper divisors (1778467).

40904189 is a wasteful number, since it uses less digits than its factorization.

40904189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778466.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 40904189 is about 6395.6382793276. The cubic root of 40904189 is about 344.5529152380.

The spelling of 40904189 in words is "forty million, nine hundred four thousand, one hundred eighty-nine".