40979909 has 4 divisors (see below), whose sum is σ = 40999104. Its totient is φ = 40960716.

The previous prime is 40979899. The next prime is 40979921. The reversal of 40979909 is 90997904.

40979909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40979909 - 2⁴ = 40979893 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 (40979959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5927 + ... + 10820.

It is an arithmetic number, because the mean of its divisors is an integer number (10249776).

Almost surely, 2^40979909 is an apocalyptic number.

It is an amenable number.

40979909 is a deficient number, since it is larger than the sum of its proper divisors (19195).

40979909 is a wasteful number, since it uses less digits than its factorization.

40979909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19194.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 40979909 is about 6401.5552016678. Note that the first 3 decimals coincide. The cubic root of 40979909 is about 344.7653911508.

The spelling of 40979909 in words is "forty million, nine hundred seventy-nine thousand, nine hundred nine".