40239691 has 4 divisors (see below), whose sum is σ = 40255072. Its totient is φ = 40224312.

The previous prime is 40239679. The next prime is 40239709. The reversal of 40239691 is 19693204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40239691 - 2¹¹ = 40237643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40239671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2676 + ... + 9361.

It is an arithmetic number, because the mean of its divisors is an integer number (10063768).

Almost surely, 2^40239691 is an apocalyptic number.

40239691 is a deficient number, since it is larger than the sum of its proper divisors (15381).

40239691 is a wasteful number, since it uses less digits than its factorization.

40239691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15380.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 40239691 is about 6343.4762551774. The cubic root of 40239691 is about 342.6769391402.

The spelling of 40239691 in words is "forty million, two hundred thirty-nine thousand, six hundred ninety-one".