40318391 has 4 divisors (see below), whose sum is σ = 41256072. Its totient is φ = 39380712.

The previous prime is 40318367. The next prime is 40318393. The reversal of 40318391 is 19381304.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40318391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40318393) 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, 468776 + ... + 468861.

It is an arithmetic number, because the mean of its divisors is an integer number (10314018).

Almost surely, 2^40318391 is an apocalyptic number.

40318391 is a deficient number, since it is larger than the sum of its proper divisors (937681).

40318391 is an equidigital number, since it uses as much as digits as its factorization.

40318391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937680.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 40318391 is about 6349.6764484500. The cubic root of 40318391 is about 342.9001939409.

Adding to 40318391 its reverse (19381304), we get a palindrome (59699695).

The spelling of 40318391 in words is "forty million, three hundred eighteen thousand, three hundred ninety-one".