40004378 has 4 divisors (see below), whose sum is σ = 60006570. Its totient is φ = 20002188.

The previous prime is 40004357. The next prime is 40004389. The reversal of 40004378 is 87340004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 28761769 + 11242609 = 5363^2 + 3353^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001093 + ... + 10001096.

Almost surely, 2^40004378 is an apocalyptic number.

40004378 is a deficient number, since it is larger than the sum of its proper divisors (20002192).

40004378 is a wasteful number, since it uses less digits than its factorization.

40004378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20002191.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 40004378 is about 6324.9014221567. The cubic root of 40004378 is about 342.0076660047.

The spelling of 40004378 in words is "forty million, four thousand, three hundred seventy-eight".