1561388 has 6 divisors (see below), whose sum is σ = 2732436. Its totient is φ = 780692.

The previous prime is 1561367. The next prime is 1561393. The reversal of 1561388 is 8831651.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195170 + ... + 195177.

It is an arithmetic number, because the mean of its divisors is an integer number (455406).

2^1561388 is an apocalyptic number.

It is an amenable number.

1561388 is a deficient number, since it is larger than the sum of its proper divisors (1171048).

1561388 is a wasteful number, since it uses less digits than its factorization.

1561388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390351 (or 390349 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 1561388 is about 1249.5551208330. Note that the first 3 decimals coincide. The cubic root of 1561388 is about 116.0121865913.

The spelling of 1561388 in words is "one million, five hundred sixty-one thousand, three hundred eighty-eight".