194963987 has 2 divisors, whose sum is σ = 194963988. Its totient is φ = 194963986.

The previous prime is 194963971. The next prime is 194964019. The reversal of 194963987 is 789369491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 194963987 - 2⁴ = 194963971 is a prime.

It is not a weakly prime, because it can be changed into another prime (194963927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97481993 + 97481994.

It is an arithmetic number, because the mean of its divisors is an integer number (97481994).

Almost surely, 2^194963987 is an apocalyptic number.

194963987 is a deficient number, since it is larger than the sum of its proper divisors (1).

194963987 is an equidigital number, since it uses as much as digits as its factorization.

194963987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 56.

The square root of 194963987 is about 13962.9505119799. The cubic root of 194963987 is about 579.8532992037.

The spelling of 194963987 in words is "one hundred ninety-four million, nine hundred sixty-three thousand, nine hundred eighty-seven".