1561888 has 12 divisors (see below), whose sum is σ = 3075030. Its totient is φ = 780928.

The previous prime is 1561883. The next prime is 1561891. The reversal of 1561888 is 8881651.

It can be written as a sum of positive squares in only one way, i.e., 1411344 + 150544 = 1188^2 + 388^2 .

It is not an unprimeable number, because it can be changed into a prime (1561883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24373 + ... + 24436.

2^1561888 is an apocalyptic number.

It is an amenable number.

1561888 is a deficient number, since it is larger than the sum of its proper divisors (1513142).

1561888 is an equidigital number, since it uses as much as digits as its factorization.

1561888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48819 (or 48811 counting only the distinct ones).

The product of its digits is 15360, while the sum is 37.

The square root of 1561888 is about 1249.7551760245. The cubic root of 1561888 is about 116.0245687159.

It can be divided in two parts, 156 and 1888, that multiplied together give a triangular number (294528 = T₇₆₇).

The spelling of 1561888 in words is "one million, five hundred sixty-one thousand, eight hundred eighty-eight".