40193879 has 4 divisors (see below), whose sum is σ = 43847880. Its totient is φ = 36539880.

The previous prime is 40193869. The next prime is 40193897. The reversal of 40193879 is 97839104.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40193879 - 2²⁰ = 39145303 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 (40193819) 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, 1826984 + ... + 1827005.

It is an arithmetic number, because the mean of its divisors is an integer number (10961970).

Almost surely, 2^40193879 is an apocalyptic number.

40193879 is a deficient number, since it is larger than the sum of its proper divisors (3654001).

40193879 is a wasteful number, since it uses less digits than its factorization.

40193879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3654000.

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

The square root of 40193879 is about 6339.8642729951. The cubic root of 40193879 is about 342.5468463813.

The spelling of 40193879 in words is "forty million, one hundred ninety-three thousand, eight hundred seventy-nine".