19406842 has 24 divisors (see below), whose sum is σ = 36470196. Its totient is φ = 7676928.

The previous prime is 19406839. The next prime is 19406867. The reversal of 19406842 is 24860491.

It can be written as a sum of positive squares in 2 ways, for example, as 16654561 + 2752281 = 4081^2 + 1659^2 .

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 19406798 and 19406807.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6343 + ... + 8890.

Almost surely, 2^19406842 is an apocalyptic number.

19406842 is a deficient number, since it is larger than the sum of its proper divisors (17063354).

19406842 is a wasteful number, since it uses less digits than its factorization.

19406842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15262 (or 15255 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 19406842 is about 4405.3197386796. The cubic root of 19406842 is about 268.7313228773.

The spelling of 19406842 in words is "nineteen million, four hundred six thousand, eight hundred forty-two".