19850140 has 24 divisors (see below), whose sum is σ = 41947920. Its totient is φ = 7890048.

The previous prime is 19850119. The next prime is 19850141. The reversal of 19850140 is 4105891.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19850099 and 19850108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19850141) 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, 216 + ... + 6304.

It is an arithmetic number, because the mean of its divisors is an integer number (1747830).

Almost surely, 2^19850140 is an apocalyptic number.

19850140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19850140 is an abundant number, since it is smaller than the sum of its proper divisors (22097780).

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

19850140 is a wasteful number, since it uses less digits than its factorization.

19850140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6261 (or 6259 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 19850140 is about 4455.3495934663. The cubic root of 19850140 is about 270.7620901894.

It can be divided in two parts, 1 and 9850140, that added together give a triangular number (9850141 = T₄₄₃₈).

The spelling of 19850140 in words is "nineteen million, eight hundred fifty thousand, one hundred forty".