40403994 has 16 divisors (see below), whose sum is σ = 85061280. Its totient is φ = 12759120.

The previous prime is 40403981. The next prime is 40403999. The reversal of 40403994 is 49930404.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40403999) 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, 177097 + ... + 177324.

It is an arithmetic number, because the mean of its divisors is an integer number (5316330).

Almost surely, 2^40403994 is an apocalyptic number.

40403994 is an abundant number, since it is smaller than the sum of its proper divisors (44657286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40403994 is a wasteful number, since it uses less digits than its factorization.

40403994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354445.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 40403994 is about 6356.4136114636. The cubic root of 40403994 is about 343.1427014335.

The spelling of 40403994 in words is "forty million, four hundred three thousand, nine hundred ninety-four".