19098640 has 60 divisors (see below), whose sum is σ = 48832812. Its totient is φ = 6941440.

The previous prime is 19098637. The next prime is 19098643. The reversal of 19098640 is 4689091.

It is an interprime number because it is at equal distance from previous prime (19098637) and next prime (19098643).

It can be written as a sum of positive squares in 2 ways, for example, as 5438224 + 13660416 = 2332^2 + 3696^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 19098640.

It is not an unprimeable number, because it can be changed into a prime (19098643) 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, 8694 + ... + 10666.

Almost surely, 2^19098640 is an apocalyptic number.

19098640 is a gapful number since it is divisible by the number (10) 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 19098640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24416406).

19098640 is an abundant number, since it is smaller than the sum of its proper divisors (29734172).

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

19098640 is a wasteful number, since it uses less digits than its factorization.

19098640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2008 (or 1991 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 19098640 is about 4370.1990801335. The cubic root of 19098640 is about 267.3011419845.

The spelling of 19098640 in words is "nineteen million, ninety-eight thousand, six hundred forty".