19113640 has 128 divisors (see below), whose sum is σ = 54432000. Its totient is φ = 5879808.

The previous prime is 19113623. The next prime is 19113641. The reversal of 19113640 is 4631191.

It is not an unprimeable number, because it can be changed into a prime (19113641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 214716 + ... + 214804.

It is an arithmetic number, because the mean of its divisors is an integer number (425250).

Almost surely, 2^19113640 is an apocalyptic number.

19113640 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 19113640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27216000).

19113640 is an abundant number, since it is smaller than the sum of its proper divisors (35318360).

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

19113640 is a wasteful number, since it uses less digits than its factorization.

19113640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 19113640 is about 4371.9149122553. The cubic root of 19113640 is about 267.3711027758.

It can be divided in two parts, 191 and 13640, that added together give a palindrome (13831).

The spelling of 19113640 in words is "nineteen million, one hundred thirteen thousand, six hundred forty".