19842690 has 64 divisors (see below), whose sum is σ = 55353600. Its totient is φ = 4458240.

The previous prime is 19842679. The next prime is 19842709. The reversal of 19842690 is 9624891.

It is a super-2 number, since 2×19842690² = 787464692872200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12036 + ... + 13584.

It is an arithmetic number, because the mean of its divisors is an integer number (864900).

Almost surely, 2^19842690 is an apocalyptic number.

19842690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19842690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27676800).

19842690 is an abundant number, since it is smaller than the sum of its proper divisors (35510910).

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

19842690 is a wasteful number, since it uses less digits than its factorization.

19842690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 19842690 is about 4454.5134414434. The cubic root of 19842690 is about 270.7282125109.

The spelling of 19842690 in words is "nineteen million, eight hundred forty-two thousand, six hundred ninety".