187640623 has 2 divisors, whose sum is σ = 187640624. Its totient is φ = 187640622.

The previous prime is 187640461. The next prime is 187640627. The reversal of 187640623 is 326046781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 187640623 - 2⁹ = 187640111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187640627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93820311 + 93820312.

It is an arithmetic number, because the mean of its divisors is an integer number (93820312).

Almost surely, 2^187640623 is an apocalyptic number.

187640623 is a deficient number, since it is larger than the sum of its proper divisors (1).

187640623 is an equidigital number, since it uses as much as digits as its factorization.

187640623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 187640623 is about 13698.1978011708. The cubic root of 187640623 is about 572.5001727655.

The spelling of 187640623 in words is "one hundred eighty-seven million, six hundred forty thousand, six hundred twenty-three".