40905187 has 2 divisors, whose sum is σ = 40905188. Its totient is φ = 40905186.

The previous prime is 40905131. The next prime is 40905199. The reversal of 40905187 is 78150904.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40905187 - 2²³ = 32516579 is a prime.

It is not a weakly prime, because it can be changed into another prime (40905107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20452593 + 20452594.

It is an arithmetic number, because the mean of its divisors is an integer number (20452594).

Almost surely, 2^40905187 is an apocalyptic number.

40905187 is a deficient number, since it is larger than the sum of its proper divisors (1).

40905187 is an equidigital number, since it uses as much as digits as its factorization.

40905187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 40905187 is about 6395.7163007751. The cubic root of 40905187 is about 344.5557174043. Note that the first 3 decimals are identical.

The spelling of 40905187 in words is "forty million, nine hundred five thousand, one hundred eighty-seven".