18701940 has 48 divisors (see below), whose sum is σ = 52573248. Its totient is φ = 4967424.

The previous prime is 18701933. The next prime is 18701941. The reversal of 18701940 is 4910781.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18701898 and 18701907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18701941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20739 + ... + 21621.

It is an arithmetic number, because the mean of its divisors is an integer number (1095276).

Almost surely, 2^18701940 is an apocalyptic number.

18701940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18701940 is an abundant number, since it is smaller than the sum of its proper divisors (33871308).

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

18701940 is a wasteful number, since it uses less digits than its factorization.

18701940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248 (or 1246 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 18701940 is about 4324.5739674562. The cubic root of 18701940 is about 265.4374642136.

The spelling of 18701940 in words is "eighteen million, seven hundred one thousand, nine hundred forty".