40187393 has 4 divisors (see below), whose sum is σ = 40295508. Its totient is φ = 40079280.

The previous prime is 40187387. The next prime is 40187419. The reversal of 40187393 is 39378104.

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

It can be written as a sum of positive squares in 2 ways, for example, as 30558784 + 9628609 = 5528^2 + 3103^2 .

It is a cyclic number.

It is not a de Polignac number, because 40187393 - 2⁸ = 40187137 is a prime.

It is a super-2 number, since 2×40187393² = 3230053112272898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40187353) 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, 53498 + ... + 54243.

It is an arithmetic number, because the mean of its divisors is an integer number (10073877).

Almost surely, 2^40187393 is an apocalyptic number.

It is an amenable number.

40187393 is a deficient number, since it is larger than the sum of its proper divisors (108115).

40187393 is a wasteful number, since it uses less digits than its factorization.

40187393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108114.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 40187393 is about 6339.3527272112. The cubic root of 40187393 is about 342.5284200403.

It can be divided in two parts, 4018 and 7393, that added together give a palindrome (11411).

The spelling of 40187393 in words is "forty million, one hundred eighty-seven thousand, three hundred ninety-three".