40865997 has 4 divisors (see below), whose sum is σ = 54488000. Its totient is φ = 27243996.

The previous prime is 40865947. The next prime is 40866037. The reversal of 40865997 is 79956804.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 40865997 - 2¹⁵ = 40833229 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 (40865947) 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, 6810997 + ... + 6811002.

It is an arithmetic number, because the mean of its divisors is an integer number (13622000).

Almost surely, 2^40865997 is an apocalyptic number.

It is an amenable number.

40865997 is a deficient number, since it is larger than the sum of its proper divisors (13622003).

40865997 is a wasteful number, since it uses less digits than its factorization.

40865997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13622002.

The product of its (nonzero) digits is 544320, while the sum is 48.

The square root of 40865997 is about 6392.6517971809. The cubic root of 40865997 is about 344.4456461707.

The spelling of 40865997 in words is "forty million, eight hundred sixty-five thousand, nine hundred ninety-seven".