40491909 has 24 divisors (see below), whose sum is σ = 62180352. Its totient is φ = 25303680.

The previous prime is 40491881. The next prime is 40491911. The reversal of 40491909 is 90919404.

It is not a de Polignac number, because 40491909 - 2⁹ = 40491397 is a prime.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40491959) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58254 + ... + 58944.

It is an arithmetic number, because the mean of its divisors is an integer number (2590848).

Almost surely, 2^40491909 is an apocalyptic number.

It is an amenable number.

40491909 is a deficient number, since it is larger than the sum of its proper divisors (21688443).

40491909 is a wasteful number, since it uses less digits than its factorization.

40491909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097 (or 1094 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 40491909 is about 6363.3253099303. The cubic root of 40491909 is about 343.3914023962.

The spelling of 40491909 in words is "forty million, four hundred ninety-one thousand, nine hundred nine".