18142740 has 324 divisors, whose sum is σ = 74506068. Its totient is φ = 3548160.

The previous prime is 18142717. The next prime is 18142753. The reversal of 18142740 is 4724181.

It can be written as a sum of positive squares in 2 ways, for example, as 10458756 + 7683984 = 3234^2 + 2772^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 1067212 + ... + 1067228.

It is an arithmetic number, because the mean of its divisors is an integer number (229957).

Almost surely, 2^18142740 is an apocalyptic number.

18142740 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 18142740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37253034).

18142740 is an abundant number, since it is smaller than the sum of its proper divisors (56363328).

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

18142740 is a wasteful number, since it uses less digits than its factorization.

18142740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 45 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 18142740 is about 4259.4295392693. The cubic root of 18142740 is about 262.7650655870.

It can be divided in two parts, 1814 and 2740, that added together give a palindrome (4554).

The spelling of 18142740 in words is "eighteen million, one hundred forty-two thousand, seven hundred forty".