1561456 has 20 divisors (see below), whose sum is σ = 3258472. Its totient is φ = 720576.

The previous prime is 1561453. The next prime is 1561457. The reversal of 1561456 is 6541651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561453) 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, 3546 + ... + 3961.

2^1561456 is an apocalyptic number.

1561456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1561456 is an abundant number, since it is smaller than the sum of its proper divisors (1697016).

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

1561456 is a wasteful number, since it uses less digits than its factorization.

1561456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7528 (or 7522 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 1561456 is about 1249.5823302208. The cubic root of 1561456 is about 116.0138707155.

The spelling of 1561456 in words is "one million, five hundred sixty-one thousand, four hundred fifty-six".