40057994 has 4 divisors (see below), whose sum is σ = 60086994. Its totient is φ = 20028996.

The previous prime is 40057981. The next prime is 40057999. The reversal of 40057994 is 49975004.

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., 21022225 + 19035769 = 4585^2 + 4363^2 .

It is not an unprimeable number, because it can be changed into a prime (40057999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10014497 + ... + 10014500.

Almost surely, 2^40057994 is an apocalyptic number.

40057994 is a deficient number, since it is larger than the sum of its proper divisors (20029000).

40057994 is a wasteful number, since it uses less digits than its factorization.

40057994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20028999.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 40057994 is about 6329.1384879776. The cubic root of 40057994 is about 342.1603900974.

The spelling of 40057994 in words is "forty million, fifty-seven thousand, nine hundred ninety-four".