40628491 has 2 divisors, whose sum is σ = 40628492. Its totient is φ = 40628490.

The previous prime is 40628477. The next prime is 40628509. The reversal of 40628491 is 19482604.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40628491 - 2¹⁷ = 40497419 is a prime.

It is equal to p_2469526 and since 40628491 and 2469526 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40628191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20314245 + 20314246.

It is an arithmetic number, because the mean of its divisors is an integer number (20314246).

Almost surely, 2^40628491 is an apocalyptic number.

40628491 is a deficient number, since it is larger than the sum of its proper divisors (1).

40628491 is an equidigital number, since it uses as much as digits as its factorization.

40628491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 40628491 is about 6374.0482426791. The cubic root of 40628491 is about 343.7770633899. Note that the first 3 decimals are identical.

The spelling of 40628491 in words is "forty million, six hundred twenty-eight thousand, four hundred ninety-one".