40279813 has 6 divisors (see below), whose sum is σ = 46856166. Its totient is φ = 34525512.

The previous prime is 40279747. The next prime is 40279823. The reversal of 40279813 is 31897204.

40279813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 39162564 + 1117249 = 6258^2 + 1057^2 .

It is a de Polignac number, because none of the positive numbers 2^k-40279813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40279823) 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 5 ways as a sum of consecutive naturals, for example, 410970 + ... + 411067.

It is an arithmetic number, because the mean of its divisors is an integer number (7809361).

Almost surely, 2^40279813 is an apocalyptic number.

It is an amenable number.

40279813 is a deficient number, since it is larger than the sum of its proper divisors (6576353).

40279813 is an equidigital number, since it uses as much as digits as its factorization.

40279813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822051 (or 822044 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 40279813 is about 6346.6379288565. The cubic root of 40279813 is about 342.7907928734.

The spelling of 40279813 in words is "forty million, two hundred seventy-nine thousand, eight hundred thirteen".