19798156 has 36 divisors (see below), whose sum is σ = 40822488. Its totient is φ = 8375808.

The previous prime is 19798153. The next prime is 19798159. The reversal of 19798156 is 65189791.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19798153) and next prime (19798159).

It is not an unprimeable number, because it can be changed into a prime (19798153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15660 + ... + 16876.

It is an arithmetic number, because the mean of its divisors is an integer number (1133958).

Almost surely, 2^19798156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19798156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20411244).

19798156 is an abundant number, since it is smaller than the sum of its proper divisors (21024332).

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

19798156 is a wasteful number, since it uses less digits than its factorization.

19798156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318 (or 1309 counting only the distinct ones).

The product of its digits is 136080, while the sum is 46.

The square root of 19798156 is about 4449.5118833418. The cubic root of 19798156 is about 270.5255242456.

The spelling of 19798156 in words is "nineteen million, seven hundred ninety-eight thousand, one hundred fifty-six".