18140202 has 12 divisors (see below), whose sum is σ = 39303810. Its totient is φ = 6046728.

The previous prime is 18140191. The next prime is 18140203. The reversal of 18140202 is 20204181.

It can be written as a sum of positive squares in only one way, i.e., 17313921 + 826281 = 4161^2 + 909^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1007789 = 18140202 / (1 + 8 + 1 + 4 + 0 + 2 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (18140203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 503877 + ... + 503912.

Almost surely, 2^18140202 is an apocalyptic number.

18140202 is an abundant number, since it is smaller than the sum of its proper divisors (21163608).

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

18140202 is a wasteful number, since it uses less digits than its factorization.

18140202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007797 (or 1007794 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 18140202 is about 4259.1316016296. The cubic root of 18140202 is about 262.7528122222.

Adding to 18140202 its reverse (20204181), we get a palindrome (38344383).

The spelling of 18140202 in words is "eighteen million, one hundred forty thousand, two hundred two".