19898772 has 48 divisors (see below), whose sum is σ = 51311232. Its totient is φ = 5969920.

The previous prime is 19898771. The next prime is 19898783. The reversal of 19898772 is 27789891.

It is a super-2 number, since 2×19898772² = 791922254215968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19898771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2572 + ... + 6812.

It is an arithmetic number, because the mean of its divisors is an integer number (1068984).

Almost surely, 2^19898772 is an apocalyptic number.

19898772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19898772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25655616).

19898772 is an abundant number, since it is smaller than the sum of its proper divisors (31412460).

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

19898772 is a wasteful number, since it uses less digits than its factorization.

19898772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288 (or 4286 counting only the distinct ones).

The product of its digits is 508032, while the sum is 51.

The square root of 19898772 is about 4460.8039634129. The cubic root of 19898772 is about 270.9830283985.

The spelling of 19898772 in words is "nineteen million, eight hundred ninety-eight thousand, seven hundred seventy-two".