40019913 has 32 divisors (see below), whose sum is σ = 62188800. Its totient is φ = 25719120.

The previous prime is 40019911. The next prime is 40019933. The reversal of 40019913 is 31991004.

40019913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40019913 - 2¹ = 40019911 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (40019911) 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 31 ways as a sum of consecutive naturals, for example, 63108 + ... + 63738.

It is an arithmetic number, because the mean of its divisors is an integer number (1943400).

Almost surely, 2^40019913 is an apocalyptic number.

It is an amenable number.

40019913 is a deficient number, since it is larger than the sum of its proper divisors (22168887).

40019913 is an frugal number, since it uses more digits than its factorization.

40019913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681 (or 663 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 40019913 is about 6326.1293853351. The cubic root of 40019913 is about 342.0519311723.

The spelling of 40019913 in words is "forty million, nineteen thousand, nine hundred thirteen".