40891539 has 16 divisors (see below), whose sum is σ = 61270272. Its totient is φ = 24069408.

The previous prime is 40891523. The next prime is 40891541. The reversal of 40891539 is 93519804.

It is not a de Polignac number, because 40891539 - 2⁴ = 40891523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 40891497 and 40891506.

It is not an unprimeable number, because it can be changed into a prime (40891639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21897 + ... + 23690.

It is an arithmetic number, because the mean of its divisors is an integer number (3829392).

Almost surely, 2^40891539 is an apocalyptic number.

40891539 is a deficient number, since it is larger than the sum of its proper divisors (20378733).

40891539 is a wasteful number, since it uses less digits than its factorization.

40891539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45626.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 40891539 is about 6394.6492476132. The cubic root of 40891539 is about 344.5173928472.

The spelling of 40891539 in words is "forty million, eight hundred ninety-one thousand, five hundred thirty-nine".