19890140 has 24 divisors (see below), whose sum is σ = 41874000. Its totient is φ = 7936128.

The previous prime is 19890137. The next prime is 19890149. The reversal of 19890140 is 4109891.

It is a junction number, because it is equal to n+sod(n) for n = 19890097 and 19890106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19890149) 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, 8984 + ... + 10976.

It is an arithmetic number, because the mean of its divisors is an integer number (1744750).

Almost surely, 2^19890140 is an apocalyptic number.

19890140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19890140 is an abundant number, since it is smaller than the sum of its proper divisors (21983860).

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

19890140 is a wasteful number, since it uses less digits than its factorization.

19890140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2501 (or 2499 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 19890140 is about 4459.8363198665. The cubic root of 19890140 is about 270.9438389815.

The spelling of 19890140 in words is "nineteen million, eight hundred ninety thousand, one hundred forty".