1561950 has 96 divisors (see below), whose sum is σ = 4687200. Its totient is φ = 380160.

The previous prime is 1561919. The next prime is 1562051. The reversal of 1561950 is 591651.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17506 + ... + 17594.

It is an arithmetic number, because the mean of its divisors is an integer number (48825).

2^1561950 is an apocalyptic number.

1561950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2343600).

1561950 is an abundant number, since it is smaller than the sum of its proper divisors (3125250).

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

1561950 is a wasteful number, since it uses less digits than its factorization.

1561950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 1561950 is about 1249.7799806366. The cubic root of 1561950 is about 116.0261039152.

Subtracting from 1561950 its reverse (591651), we obtain a cube (970299 = 99³).

The spelling of 1561950 in words is "one million, five hundred sixty-one thousand, nine hundred fifty".