1630939 has 4 divisors (see below), whose sum is σ = 1670760. Its totient is φ = 1591120.

The previous prime is 1630933. The next prime is 1630943. The reversal of 1630939 is 9390361.

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

It is a cyclic number.

It is not a de Polignac number, because 1630939 - 2⁹ = 1630427 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1630939.

It is not an unprimeable number, because it can be changed into a prime (1630933) 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, 19849 + ... + 19930.

It is an arithmetic number, because the mean of its divisors is an integer number (417690).

2^1630939 is an apocalyptic number.

1630939 is a deficient number, since it is larger than the sum of its proper divisors (39821).

1630939 is an equidigital number, since it uses as much as digits as its factorization.

1630939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39820.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 1630939 is about 1277.0822213154. The cubic root of 1630939 is about 117.7097866807.

The spelling of 1630939 in words is "one million, six hundred thirty thousand, nine hundred thirty-nine".