40878217 has 8 divisors (see below), whose sum is σ = 43365672. Its totient is φ = 38400000.

The previous prime is 40878143. The next prime is 40878221. The reversal of 40878217 is 71287804.

It can be written as a sum of positive squares in 4 ways, for example, as 7284601 + 33593616 = 2699^2 + 5796^2 .

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 40878217 - 2²³ = 32489609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40878017) 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, 8217 + ... + 12217.

It is an arithmetic number, because the mean of its divisors is an integer number (5420709).

Almost surely, 2^40878217 is an apocalyptic number.

It is an amenable number.

40878217 is a deficient number, since it is larger than the sum of its proper divisors (2487455).

40878217 is a wasteful number, since it uses less digits than its factorization.

40878217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4619.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 40878217 is about 6393.6075106312. The cubic root of 40878217 is about 344.4799754960.

The spelling of 40878217 in words is "forty million, eight hundred seventy-eight thousand, two hundred seventeen".