19561842 has 12 divisors (see below), whose sum is σ = 42384030. Its totient is φ = 6520608.

The previous prime is 19561831. The next prime is 19561859. The reversal of 19561842 is 24816591.

19561842 is a `hidden beast` number, since 19 + 561 + 84 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18071001 + 1490841 = 4251^2 + 1221^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19561797 and 19561806.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 543367 + ... + 543402.

Almost surely, 2^19561842 is an apocalyptic number.

19561842 is an abundant number, since it is smaller than the sum of its proper divisors (22822188).

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

19561842 is a wasteful number, since it uses less digits than its factorization.

19561842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086777 (or 1086774 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 19561842 is about 4422.8771178951. The cubic root of 19561842 is about 269.4448676351. Note that the first 3 decimals are identical.

The spelling of 19561842 in words is "nineteen million, five hundred sixty-one thousand, eight hundred forty-two".