40658491 has 2 divisors, whose sum is σ = 40658492. Its totient is φ = 40658490.

The previous prime is 40658489. The next prime is 40658531. The reversal of 40658491 is 19485604.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40658491 - 2¹ = 40658489 is a prime.

It is a super-5 number, since 5×40658491⁵ (a number of 39 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

Together with 40658489, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 40658491.

It is not a weakly prime, because it can be changed into another prime (40655491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20329245 + 20329246.

It is an arithmetic number, because the mean of its divisors is an integer number (20329246).

Almost surely, 2^40658491 is an apocalyptic number.

40658491 is a deficient number, since it is larger than the sum of its proper divisors (1).

40658491 is an equidigital number, since it uses as much as digits as its factorization.

40658491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 40658491 is about 6376.4011009346. The cubic root of 40658491 is about 343.8616573472.

The spelling of 40658491 in words is "forty million, six hundred fifty-eight thousand, four hundred ninety-one".