40014391 has 2 divisors, whose sum is σ = 40014392. Its totient is φ = 40014390.

The previous prime is 40014389. The next prime is 40014407. The reversal of 40014391 is 19341004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40014391 - 2¹ = 40014389 is a prime.

Together with 40014389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40014371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20007195 + 20007196.

It is an arithmetic number, because the mean of its divisors is an integer number (20007196).

Almost surely, 2^40014391 is an apocalyptic number.

40014391 is a deficient number, since it is larger than the sum of its proper divisors (1).

40014391 is an equidigital number, since it uses as much as digits as its factorization.

40014391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 40014391 is about 6325.6929264706. The cubic root of 40014391 is about 342.0361981908.

Adding to 40014391 its reverse (19341004), we get a palindrome (59355395).

The spelling of 40014391 in words is "forty million, fourteen thousand, three hundred ninety-one".