40798979 has 4 divisors (see below), whose sum is σ = 43937376. Its totient is φ = 37660584.

The previous prime is 40798939. The next prime is 40798981. The reversal of 40798979 is 97989704.

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

It is a de Polignac number, because none of the positive numbers 2^k-40798979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40798979.

It is not an unprimeable number, because it can be changed into a prime (40798939) 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, 1569179 + ... + 1569204.

It is an arithmetic number, because the mean of its divisors is an integer number (10984344).

Almost surely, 2^40798979 is an apocalyptic number.

40798979 is a deficient number, since it is larger than the sum of its proper divisors (3138397).

40798979 is a wasteful number, since it uses less digits than its factorization.

40798979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138396.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The square root of 40798979 is about 6387.4078466934. The cubic root of 40798979 is about 344.2572524744.

The spelling of 40798979 in words is "forty million, seven hundred ninety-eight thousand, nine hundred seventy-nine".