18974740 has 24 divisors (see below), whose sum is σ = 39954600. Its totient is φ = 7569408.

The previous prime is 18974731. The next prime is 18974741. The reversal of 18974740 is 4747981.

It can be written as a sum of positive squares in 4 ways, for example, as 4 + 18974736 = 2^2 + 4356^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18974693 and 18974702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18974741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7924 + ... + 10036.

It is an arithmetic number, because the mean of its divisors is an integer number (1664775).

Almost surely, 2^18974740 is an apocalyptic number.

18974740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18974740 is an abundant number, since it is smaller than the sum of its proper divisors (20979860).

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

18974740 is a wasteful number, since it uses less digits than its factorization.

18974740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571 (or 2569 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 18974740 is about 4356.0004591368. Note that the first 3 decimals coincide. The cubic root of 18974740 is about 266.7218601033.

The spelling of 18974740 in words is "eighteen million, nine hundred seventy-four thousand, seven hundred forty".