18914940 has 144 divisors (see below), whose sum is σ = 64393056. Its totient is φ = 4454400.

The previous prime is 18914933. The next prime is 18914963. The reversal of 18914940 is 4941981.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18914895 and 18914904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81064 + ... + 81296.

It is an arithmetic number, because the mean of its divisors is an integer number (447174).

Almost surely, 2^18914940 is an apocalyptic number.

18914940 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 18914940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32196528).

18914940 is an abundant number, since it is smaller than the sum of its proper divisors (45478116).

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

18914940 is a wasteful number, since it uses less digits than its factorization.

18914940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18914940 is about 4349.1309476722. The cubic root of 18914940 is about 266.4413687345.

It can be divided in two parts, 189 and 14940, that added together give a square (15129 = 123²).

The spelling of 18914940 in words is "eighteen million, nine hundred fourteen thousand, nine hundred forty".