18903740 has 24 divisors (see below), whose sum is σ = 39781392. Its totient is φ = 7545600.

The previous prime is 18903739. The next prime is 18903743. The reversal of 18903740 is 4730981.

It is a junction number, because it is equal to n+sod(n) for n = 18903697 and 18903706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18903743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15140 + ... + 16340.

It is an arithmetic number, because the mean of its divisors is an integer number (1657558).

Almost surely, 2^18903740 is an apocalyptic number.

18903740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18903740 is an abundant number, since it is smaller than the sum of its proper divisors (20877652).

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

18903740 is a wasteful number, since it uses less digits than its factorization.

18903740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997 (or 1995 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 18903740 is about 4347.8431434448. The cubic root of 18903740 is about 266.3887695278.

The spelling of 18903740 in words is "eighteen million, nine hundred three thousand, seven hundred forty".