19116640 has 48 divisors (see below), whose sum is σ = 45502128. Its totient is φ = 7589376.

The previous prime is 19116631. The next prime is 19116659. The reversal of 19116640 is 4661191.

It is a junction number, because it is equal to n+sod(n) for n = 19116599 and 19116608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25714 + ... + 26446.

It is an arithmetic number, because the mean of its divisors is an integer number (947961).

Almost surely, 2^19116640 is an apocalyptic number.

19116640 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 19116640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22751064).

19116640 is an abundant number, since it is smaller than the sum of its proper divisors (26385488).

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

19116640 is a wasteful number, since it uses less digits than its factorization.

19116640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911 (or 903 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 19116640 is about 4372.2579978771. The cubic root of 19116640 is about 267.3850905414.

The spelling of 19116640 in words is "nineteen million, one hundred sixteen thousand, six hundred forty".