1813156 has 6 divisors (see below), whose sum is σ = 3173030. Its totient is φ = 906576.

The previous prime is 1813139. The next prime is 1813157. The reversal of 1813156 is 6513181.

It can be written as a sum of positive squares in only one way, i.e., 1742400 + 70756 = 1320^2 + 266^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1813156.

It is not an unprimeable number, because it can be changed into a prime (1813157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 226641 + ... + 226648.

2^1813156 is an apocalyptic number.

It is an amenable number.

1813156 is a deficient number, since it is larger than the sum of its proper divisors (1359874).

1813156 is a wasteful number, since it uses less digits than its factorization.

1813156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453293 (or 453291 counting only the distinct ones).

The product of its digits is 720, while the sum is 25.

The square root of 1813156 is about 1346.5348120268. The cubic root of 1813156 is about 121.9396817299.

Adding to 1813156 its sum of digits (25), we get a palindrome (1813181).

The spelling of 1813156 in words is "one million, eight hundred thirteen thousand, one hundred fifty-six".