3890461987 has 2 divisors, whose sum is σ = 3890461988. Its totient is φ = 3890461986.

The previous prime is 3890461961. The next prime is 3890462039. The reversal of 3890461987 is 7891640983.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3890461987 - 2¹⁵ = 3890429219 is a prime.

It is not a weakly prime, because it can be changed into another prime (3890461787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1945230993 + 1945230994.

It is an arithmetic number, because the mean of its divisors is an integer number (1945230994).

Almost surely, 2^3890461987 is an apocalyptic number.

3890461987 is a deficient number, since it is larger than the sum of its proper divisors (1).

3890461987 is an equidigital number, since it uses as much as digits as its factorization.

3890461987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The square root of 3890461987 is about 62373.5680156266. The cubic root of 3890461987 is about 1572.7766713922.

The spelling of 3890461987 in words is "three billion, eight hundred ninety million, four hundred sixty-one thousand, nine hundred eighty-seven".