1630969 has 4 divisors (see below), whose sum is σ = 1661796. Its totient is φ = 1600144.

The previous prime is 1630943. The next prime is 1630987. The reversal of 1630969 is 9690361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 620944 + 1010025 = 788^2 + 1005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1630969 - 2⁷ = 1630841 is a prime.

It is a super-2 number, since 2×1630969² = 5320119757922, which contains 22 as substring.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1630919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15334 + ... + 15439.

It is an arithmetic number, because the mean of its divisors is an integer number (415449).

2^1630969 is an apocalyptic number.

It is an amenable number.

1630969 is a deficient number, since it is larger than the sum of its proper divisors (30827).

1630969 is an equidigital number, since it uses as much as digits as its factorization.

1630969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30826.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 1630969 is about 1277.0939667855. The cubic root of 1630969 is about 117.7105084065.

The spelling of 1630969 in words is "one million, six hundred thirty thousand, nine hundred sixty-nine".