40918391 has 4 divisors (see below), whose sum is σ = 42329400. Its totient is φ = 39507384.

The previous prime is 40918387. The next prime is 40918399. The reversal of 40918391 is 19381904.

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 40918391 - 2² = 40918387 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 (40918399) 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, 705461 + ... + 705518.

It is an arithmetic number, because the mean of its divisors is an integer number (10582350).

Almost surely, 2^40918391 is an apocalyptic number.

40918391 is a deficient number, since it is larger than the sum of its proper divisors (1411009).

40918391 is a wasteful number, since it uses less digits than its factorization.

40918391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411008.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 40918391 is about 6396.7484709030. The cubic root of 40918391 is about 344.5927870654.

The spelling of 40918391 in words is "forty million, nine hundred eighteen thousand, three hundred ninety-one".