40978217 has 4 divisors (see below), whose sum is σ = 46832256. Its totient is φ = 35124180.

The previous prime is 40978199. The next prime is 40978237. The reversal of 40978217 is 71287904.

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 40978217 - 2⁸ = 40977961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40978237) 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, 2927009 + ... + 2927022.

It is an arithmetic number, because the mean of its divisors is an integer number (11708064).

Almost surely, 2^40978217 is an apocalyptic number.

It is an amenable number.

40978217 is a deficient number, since it is larger than the sum of its proper divisors (5854039).

40978217 is an equidigital number, since it uses as much as digits as its factorization.

40978217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5854038.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 40978217 is about 6401.4230449174. The cubic root of 40978217 is about 344.7606461339.

The spelling of 40978217 in words is "forty million, nine hundred seventy-eight thousand, two hundred seventeen".