19869642 has 24 divisors (see below), whose sum is σ = 46363044. Its totient is φ = 6113664.

The previous prime is 19869623. The next prime is 19869671. The reversal of 19869642 is 24696891.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17464041 + 2405601 = 4179^2 + 1551^2 .

It is a super-3 number, since 3×19869642³ (a number of 23 digits) contains 333 as substring.

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, 42223 + ... + 42690.

Almost surely, 2^19869642 is an apocalyptic number.

19869642 is an abundant number, since it is smaller than the sum of its proper divisors (26493402).

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

19869642 is a wasteful number, since it uses less digits than its factorization.

19869642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84934 (or 84931 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 19869642 is about 4457.5376610860. The cubic root of 19869642 is about 270.8507322839.

It can be divided in two parts, 1986 and 9642, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 19869642 in words is "nineteen million, eight hundred sixty-nine thousand, six hundred forty-two".