18729740 has 12 divisors (see below), whose sum is σ = 39332496. Its totient is φ = 7491888.

The previous prime is 18729731. The next prime is 18729749. The reversal of 18729740 is 4792781.

It is an interprime number because it is at equal distance from previous prime (18729731) and next prime (18729749).

It is a junction number, because it is equal to n+sod(n) for n = 18729694 and 18729703.

It is not an unprimeable number, because it can be changed into a prime (18729749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 468224 + ... + 468263.

It is an arithmetic number, because the mean of its divisors is an integer number (3277708).

Almost surely, 2^18729740 is an apocalyptic number.

18729740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18729740 is an abundant number, since it is smaller than the sum of its proper divisors (20602756).

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

18729740 is a wasteful number, since it uses less digits than its factorization.

18729740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936496 (or 936494 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 18729740 is about 4327.7869633336. The cubic root of 18729740 is about 265.5689213103.

The spelling of 18729740 in words is "eighteen million, seven hundred twenty-nine thousand, seven hundred forty".