1815012 has 18 divisors (see below), whose sum is σ = 4588038. Its totient is φ = 604992.

The previous prime is 1815007. The next prime is 1815043. The reversal of 1815012 is 2105181.

It can be written as a sum of positive squares in only one way, i.e., 1425636 + 389376 = 1194^2 + 624^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25173 + ... + 25244.

It is an arithmetic number, because the mean of its divisors is an integer number (254891).

2^1815012 is an apocalyptic number.

1815012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1815012 is an abundant number, since it is smaller than the sum of its proper divisors (2773026).

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

1815012 is a wasteful number, since it uses less digits than its factorization.

1815012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50427 (or 50422 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 1815012 is about 1347.2238121411. The cubic root of 1815012 is about 121.9812745604.

It can be divided in two parts, 181501 and 2, that added together give a triangular number (181503 = T₆₀₂).

The spelling of 1815012 in words is "one million, eight hundred fifteen thousand, twelve".