40649979 has 8 divisors (see below), whose sum is σ = 54231040. Its totient is φ = 27084456.

The previous prime is 40649963. The next prime is 40649989. The reversal of 40649979 is 97994604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40649979 - 2⁴ = 40649963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40649989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5382 + ... + 10500.

It is an arithmetic number, because the mean of its divisors is an integer number (6778880).

Almost surely, 2^40649979 is an apocalyptic number.

40649979 is a deficient number, since it is larger than the sum of its proper divisors (13581061).

40649979 is a wasteful number, since it uses less digits than its factorization.

40649979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7769.

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 40649979 is about 6375.7336048489. The cubic root of 40649979 is about 343.8376594513.

The spelling of 40649979 in words is "forty million, six hundred forty-nine thousand, nine hundred seventy-nine".