19907442 has 48 divisors (see below), whose sum is σ = 46399392. Its totient is φ = 6145920.

The previous prime is 19907429. The next prime is 19907449. The reversal of 19907442 is 24470991.

It is a junction number, because it is equal to n+sod(n) for n = 19907397 and 19907406.

It is not an unprimeable number, because it can be changed into a prime (19907449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20017 + ... + 20987.

It is an arithmetic number, because the mean of its divisors is an integer number (966654).

Almost surely, 2^19907442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19907442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23199696).

19907442 is an abundant number, since it is smaller than the sum of its proper divisors (26491950).

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

19907442 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (19907441) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (1063).

19907442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063 (or 1060 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 19907442 is about 4461.7756554986. The cubic root of 19907442 is about 271.0223789292.

The spelling of 19907442 in words is "nineteen million, nine hundred seven thousand, four hundred forty-two".