19798730 has 32 divisors (see below), whose sum is σ = 41105664. Its totient is φ = 6725376.

The previous prime is 19798729. The next prime is 19798759. The reversal of 19798730 is 3789791.

It is a super-2 number, since 2×19798730² = 783979419225800, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6659 + ... + 9161.

It is an arithmetic number, because the mean of its divisors is an integer number (1284552).

Almost surely, 2^19798730 is an apocalyptic number.

19798730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19798730 is an abundant number, since it is smaller than the sum of its proper divisors (21306934).

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

19798730 is a wasteful number, since it uses less digits than its factorization.

19798730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2630.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 19798730 is about 4449.5763843314. The cubic root of 19798730 is about 270.5281386331.

The spelling of 19798730 in words is "nineteen million, seven hundred ninety-eight thousand, seven hundred thirty".