1630840 has 16 divisors (see below), whose sum is σ = 3669480. Its totient is φ = 652320.

The previous prime is 1630829. The next prime is 1630841. The reversal of 1630840 is 480361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1630841) 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, 20346 + ... + 20425.

2^1630840 is an apocalyptic number.

1630840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1630840 is an abundant number, since it is smaller than the sum of its proper divisors (2038640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1630840 is a wasteful number, since it uses less digits than its factorization.

1630840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40782 (or 40778 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1630840 is about 1277.0434604977. The cubic root of 1630840 is about 117.7074049230.

The spelling of 1630840 in words is "one million, six hundred thirty thousand, eight hundred forty".