18849840 has 40 divisors (see below), whose sum is σ = 58435248. Its totient is φ = 5026560.

The previous prime is 18849833. The next prime is 18849871. The reversal of 18849840 is 4894881.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 18849792 and 18849801.

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, 39031 + ... + 39510.

Almost surely, 2^18849840 is an apocalyptic number.

18849840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18849840 is an abundant number, since it is smaller than the sum of its proper divisors (39585408).

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

18849840 is a wasteful number, since it uses less digits than its factorization.

18849840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78557 (or 78551 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 18849840 is about 4341.6402430418. The cubic root of 18849840 is about 266.1353448451.

The spelling of 18849840 in words is "eighteen million, eight hundred forty-nine thousand, eight hundred forty".