19715140 has 24 divisors (see below), whose sum is σ = 43202880. Its totient is φ = 7543008.

The previous prime is 19715119. The next prime is 19715149. The reversal of 19715140 is 4151791.

It is a junction number, because it is equal to n+sod(n) for n = 19715099 and 19715108.

It is not an unprimeable number, because it can be changed into a prime (19715149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20970 + ... + 21889.

It is an arithmetic number, because the mean of its divisors is an integer number (1800120).

Almost surely, 2^19715140 is an apocalyptic number.

19715140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19715140 is an abundant number, since it is smaller than the sum of its proper divisors (23487740).

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

19715140 is a wasteful number, since it uses less digits than its factorization.

19715140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42891 (or 42889 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 19715140 is about 4440.1734200367. The cubic root of 19715140 is about 270.1468793884.

The spelling of 19715140 in words is "nineteen million, seven hundred fifteen thousand, one hundred forty".