19956438 has 12 divisors (see below), whose sum is σ = 43238988. Its totient is φ = 6652140.

The previous prime is 19956407. The next prime is 19956439. The reversal of 19956438 is 83465991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19956393 and 19956402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19956439) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 554328 + ... + 554363.

It is an arithmetic number, because the mean of its divisors is an integer number (3603249).

Almost surely, 2^19956438 is an apocalyptic number.

19956438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19956438 is an abundant number, since it is smaller than the sum of its proper divisors (23282550).

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

19956438 is a wasteful number, since it uses less digits than its factorization.

19956438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108699 (or 1108696 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 19956438 is about 4467.2629204022. The cubic root of 19956438 is about 271.2445426355.

The spelling of 19956438 in words is "nineteen million, nine hundred fifty-six thousand, four hundred thirty-eight".