1561428 has 36 divisors (see below), whose sum is σ = 4306848. Its totient is φ = 473040.

The previous prime is 1561423. The next prime is 1561429. The reversal of 1561428 is 8241651.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561421) 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, 1576 + ... + 2367.

2^1561428 is an apocalyptic number.

1561428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1561428 is an abundant number, since it is smaller than the sum of its proper divisors (2745420).

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

1561428 is a wasteful number, since it uses less digits than its factorization.

1561428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3964 (or 3959 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1561428 is about 1249.5711264270. The cubic root of 1561428 is about 116.0131772585.

The spelling of 1561428 in words is "one million, five hundred sixty-one thousand, four hundred twenty-eight".