1630641 has 8 divisors (see below), whose sum is σ = 2249280. Its totient is φ = 1049552.

The previous prime is 1630633. The next prime is 1630663. The reversal of 1630641 is 1460361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1630641 - 2³ = 1630633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1630621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9285 + ... + 9458.

It is an arithmetic number, because the mean of its divisors is an integer number (281160).

2^1630641 is an apocalyptic number.

It is an amenable number.

1630641 is a deficient number, since it is larger than the sum of its proper divisors (618639).

1630641 is a wasteful number, since it uses less digits than its factorization.

1630641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18775.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1630641 is about 1276.9655437795. The cubic root of 1630641 is about 117.7026170578.

The spelling of 1630641 in words is "one million, six hundred thirty thousand, six hundred forty-one".