40947591 has 4 divisors (see below), whose sum is σ = 54596792. Its totient is φ = 27298392.

The previous prime is 40947589. The next prime is 40947619. The reversal of 40947591 is 19574904.

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

It is not a de Polignac number, because 40947591 - 2¹ = 40947589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40947541) 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, 6824596 + ... + 6824601.

It is an arithmetic number, because the mean of its divisors is an integer number (13649198).

Almost surely, 2^40947591 is an apocalyptic number.

40947591 is a deficient number, since it is larger than the sum of its proper divisors (13649201).

40947591 is a wasteful number, since it uses less digits than its factorization.

40947591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13649200.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 40947591 is about 6399.0304734389. The cubic root of 40947591 is about 344.6747364985.

The spelling of 40947591 in words is "forty million, nine hundred forty-seven thousand, five hundred ninety-one".