1561630 has 24 divisors (see below), whose sum is σ = 3270888. Its totient is φ = 535248.

The previous prime is 1561607. The next prime is 1561633. The reversal of 1561630 is 361651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1104 + ... + 2083.

It is an arithmetic number, because the mean of its divisors is an integer number (136287).

2^1561630 is an apocalyptic number.

1561630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1561630 is an abundant number, since it is smaller than the sum of its proper divisors (1709258).

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

1561630 is a wasteful number, since it uses less digits than its factorization.

1561630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3208 (or 3201 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1561630 is about 1249.6519515449. The cubic root of 1561630 is about 116.0181798696.

The spelling of 1561630 in words is "one million, five hundred sixty-one thousand, six hundred thirty".