19840140 has 120 divisors (see below), whose sum is σ = 64114512. Its totient is φ = 5132160.

The previous prime is 19840133. The next prime is 19840153. The reversal of 19840140 is 4104891.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 59775 + ... + 60105.

Almost surely, 2^19840140 is an apocalyptic number.

19840140 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 19840140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32057256).

19840140 is an abundant number, since it is smaller than the sum of its proper divisors (44274372).

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

19840140 is a wasteful number, since it uses less digits than its factorization.

19840140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 19840140 is about 4454.2272057002. The cubic root of 19840140 is about 270.7166148475.

The spelling of 19840140 in words is "nineteen million, eight hundred forty thousand, one hundred forty".