40394251 has 4 divisors (see below), whose sum is σ = 40562104. Its totient is φ = 40226400.

The previous prime is 40394239. The next prime is 40394257. The reversal of 40394251 is 15249304.

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

It is a cyclic number.

It is not a de Polignac number, because 40394251 - 2⁵ = 40394219 is a prime.

It is a super-3 number, since 3×40394251³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40394257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83565 + ... + 84046.

It is an arithmetic number, because the mean of its divisors is an integer number (10140526).

Almost surely, 2^40394251 is an apocalyptic number.

40394251 is a deficient number, since it is larger than the sum of its proper divisors (167853).

40394251 is a wasteful number, since it uses less digits than its factorization.

40394251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167852.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 40394251 is about 6355.6471739706. The cubic root of 40394251 is about 343.1151174599.

The spelling of 40394251 in words is "forty million, three hundred ninety-four thousand, two hundred fifty-one".