1630987 has 2 divisors, whose sum is σ = 1630988. Its totient is φ = 1630986.

The previous prime is 1630943. The next prime is 1631023. The reversal of 1630987 is 7890361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1630987 - 2⁷ = 1630859 is a prime.

It is an alternating number because its digits alternate between odd and even.

1630987 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1630927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815493 + 815494.

It is an arithmetic number, because the mean of its divisors is an integer number (815494).

2^1630987 is an apocalyptic number.

1630987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630987 is an equidigital number, since it uses as much as digits as its factorization.

1630987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 1630987 is about 1277.1010140157. The cubic root of 1630987 is about 117.7109414377.

The spelling of 1630987 in words is "one million, six hundred thirty thousand, nine hundred eighty-seven".