40891215 has 8 divisors (see below), whose sum is σ = 65425968. Its totient is φ = 21808640.

The previous prime is 40891187. The next prime is 40891219. The reversal of 40891215 is 51219804.

It is a happy number.

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

It is not a de Polignac number, because 40891215 - 2¹⁴ = 40874831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40891219) 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, 1363026 + ... + 1363055.

It is an arithmetic number, because the mean of its divisors is an integer number (8178246).

Almost surely, 2^40891215 is an apocalyptic number.

40891215 is a deficient number, since it is larger than the sum of its proper divisors (24534753).

40891215 is a wasteful number, since it uses less digits than its factorization.

40891215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2726089.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 40891215 is about 6394.6239138827. The cubic root of 40891215 is about 344.5164829284.

The spelling of 40891215 in words is "forty million, eight hundred ninety-one thousand, two hundred fifteen".