40039191 has 20 divisors (see below), whose sum is σ = 60164104. Its totient is φ = 26535600.

The previous prime is 40039189. The next prime is 40039211. The reversal of 40039191 is 19193004.

It is not a de Polignac number, because 40039191 - 2¹ = 40039189 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40039171) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13296 + ... + 16026.

Almost surely, 2^40039191 is an apocalyptic number.

40039191 is a deficient number, since it is larger than the sum of its proper divisors (20124913).

40039191 is a wasteful number, since it uses less digits than its factorization.

40039191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2924 (or 2915 counting only the distinct ones).

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

The square root of 40039191 is about 6327.6528823885. The cubic root of 40039191 is about 342.1068456561.

The spelling of 40039191 in words is "forty million, thirty-nine thousand, one hundred ninety-one".