1980390187 has 2 divisors, whose sum is σ = 1980390188. Its totient is φ = 1980390186.

The previous prime is 1980390173. The next prime is 1980390199. The reversal of 1980390187 is 7810930891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1980390187 - 2⁷ = 1980390059 is a prime.

It is not a weakly prime, because it can be changed into another prime (1980390157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990195093 + 990195094.

It is an arithmetic number, because the mean of its divisors is an integer number (990195094).

Almost surely, 2^1980390187 is an apocalyptic number.

1980390187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980390187 is an equidigital number, since it uses as much as digits as its factorization.

1980390187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 1980390187 is about 44501.5751069555. The cubic root of 1980390187 is about 1255.7897151823.

The spelling of 1980390187 in words is "one billion, nine hundred eighty million, three hundred ninety thousand, one hundred eighty-seven".