40394242 has 16 divisors (see below), whose sum is σ = 69338880. Its totient is φ = 17288928.

The previous prime is 40394239. The next prime is 40394257. The reversal of 40394242 is 24249304.

It is a self number, because there is not a number n which added to its sum of digits gives 40394242.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13158 + ... + 15934.

It is an arithmetic number, because the mean of its divisors is an integer number (4333680).

Almost surely, 2^40394242 is an apocalyptic number.

40394242 is a deficient number, since it is larger than the sum of its proper divisors (28944638).

40394242 is a wasteful number, since it uses less digits than its factorization.

40394242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3825.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 40394242 is about 6355.6464659388. The cubic root of 40394242 is about 343.1150919775.

It can be divided in two parts, 4039 and 4242, that added together give a square (8281 = 91²).

The spelling of 40394242 in words is "forty million, three hundred ninety-four thousand, two hundred forty-two".