18386742 has 32 divisors (see below), whose sum is σ = 40783104. Its totient is φ = 5479200.

The previous prime is 18386723. The next prime is 18386761. The reversal of 18386742 is 24768381.

It is an interprime number because it is at equal distance from previous prime (18386723) and next prime (18386761).

It is a self number, because there is not a number n which added to its sum of digits gives 18386742.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1743 + ... + 6309.

It is an arithmetic number, because the mean of its divisors is an integer number (1274472).

Almost surely, 2^18386742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18386742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20391552).

18386742 is an abundant number, since it is smaller than the sum of its proper divisors (22396362).

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

18386742 is a wasteful number, since it uses less digits than its factorization.

18386742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4644.

The product of its digits is 64512, while the sum is 39.

The square root of 18386742 is about 4287.9764458308. The cubic root of 18386742 is about 263.9378010035.

It can be divided in two parts, 18 and 386742, that added together give a triangular number (386760 = T₈₇₉).

The spelling of 18386742 in words is "eighteen million, three hundred eighty-six thousand, seven hundred forty-two".