40351994 has 4 divisors (see below), whose sum is σ = 60527994. Its totient is φ = 20175996.

The previous prime is 40351979. The next prime is 40352041. The reversal of 40351994 is 49915304.

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., 30195025 + 10156969 = 5495^2 + 3187^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10087997 + ... + 10088000.

Almost surely, 2^40351994 is an apocalyptic number.

40351994 is a deficient number, since it is larger than the sum of its proper divisors (20176000).

40351994 is a wasteful number, since it uses less digits than its factorization.

40351994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20175999.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 40351994 is about 6352.3219376855. The cubic root of 40351994 is about 342.9954298478.

The spelling of 40351994 in words is "forty million, three hundred fifty-one thousand, nine hundred ninety-four".