18700146 has 40 divisors (see below), whose sum is σ = 42405660. Its totient is φ = 6158592.

The previous prime is 18700117. The next prime is 18700163. The reversal of 18700146 is 64100781.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17969121 + 731025 = 4239^2 + 855^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13770 + ... + 15066.

Almost surely, 2^18700146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18700146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21202830).

18700146 is an abundant number, since it is smaller than the sum of its proper divisors (23705514).

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

18700146 is a wasteful number, since it uses less digits than its factorization.

18700146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400 (or 1391 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 18700146 is about 4324.3665432061. The cubic root of 18700146 is about 265.4289765017.

The spelling of 18700146 in words is "eighteen million, seven hundred thousand, one hundred forty-six".