40691431 has 8 divisors (see below), whose sum is σ = 44458128. Its totient is φ = 36936000.

The previous prime is 40691429. The next prime is 40691467. The reversal of 40691431 is 13419604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40691431 - 2¹ = 40691429 is a prime.

It is a super-2 number, since 2×40691431² = 3311585113655522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40691431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40691401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5941 + ... + 10801.

It is an arithmetic number, because the mean of its divisors is an integer number (5557266).

Almost surely, 2^40691431 is an apocalyptic number.

40691431 is a deficient number, since it is larger than the sum of its proper divisors (3766697).

40691431 is a wasteful number, since it uses less digits than its factorization.

40691431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5633.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 40691431 is about 6378.9835397185. The cubic root of 40691431 is about 343.9544935973.

The spelling of 40691431 in words is "forty million, six hundred ninety-one thousand, four hundred thirty-one".