40188457 has 4 divisors (see below), whose sum is σ = 40222336. Its totient is φ = 40154580.

The previous prime is 40188443. The next prime is 40188497. The reversal of 40188457 is 75488104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40188457 - 2⁷ = 40188329 is a prime.

It is a super-2 number, since 2×40188457² = 3230224152081698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40188427) 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, 15093 + ... + 17554.

It is an arithmetic number, because the mean of its divisors is an integer number (10055584).

Almost surely, 2^40188457 is an apocalyptic number.

It is an amenable number.

40188457 is a deficient number, since it is larger than the sum of its proper divisors (33879).

40188457 is a wasteful number, since it uses less digits than its factorization.

40188457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33878.

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 40188457 is about 6339.4366468954. The cubic root of 40188457 is about 342.5314429371.

The spelling of 40188457 in words is "forty million, one hundred eighty-eight thousand, four hundred fifty-seven".