40591897 has 8 divisors (see below), whose sum is σ = 41207040. Its totient is φ = 39979920.

The previous prime is 40591877. The next prime is 40591919. The reversal of 40591897 is 79819504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40591897 - 2⁷ = 40591769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40591877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39247 + ... + 40267.

It is an arithmetic number, because the mean of its divisors is an integer number (5150880).

Almost surely, 2^40591897 is an apocalyptic number.

It is an amenable number.

40591897 is a deficient number, since it is larger than the sum of its proper divisors (615143).

40591897 is a wasteful number, since it uses less digits than its factorization.

40591897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 40591897 is about 6371.1770498080. The cubic root of 40591897 is about 343.6738192836.

The spelling of 40591897 in words is "forty million, five hundred ninety-one thousand, eight hundred ninety-seven".