40398979 has 4 divisors (see below), whose sum is σ = 40421080. Its totient is φ = 40376880.

The previous prime is 40398977. The next prime is 40399039. The reversal of 40398979 is 97989304.

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 40398979 - 2¹ = 40398977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40398977) 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, 8034 + ... + 12055.

It is an arithmetic number, because the mean of its divisors is an integer number (10105270).

Almost surely, 2^40398979 is an apocalyptic number.

40398979 is a deficient number, since it is larger than the sum of its proper divisors (22101).

40398979 is a wasteful number, since it uses less digits than its factorization.

40398979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22100.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 40398979 is about 6356.0191157674. The cubic root of 40398979 is about 343.1285037294.

The spelling of 40398979 in words is "forty million, three hundred ninety-eight thousand, nine hundred seventy-nine".