1012644 has 36 divisors (see below), whose sum is σ = 2673216. Its totient is φ = 322608.

The previous prime is 1012637. The next prime is 1012657. The reversal of 1012644 is 4462101.

1012644 is a `hidden beast` number, since 10 + 12 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

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 11 ways as a sum of consecutive naturals, for example, 217 + ... + 1439.

It is an arithmetic number, because the mean of its divisors is an integer number (74256).

2^1012644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1012644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1336608).

1012644 is an abundant number, since it is smaller than the sum of its proper divisors (1660572).

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

1012644 is a wasteful number, since it uses less digits than its factorization.

1012644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256 (or 1251 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1012644 is about 1006.3021415062. The cubic root of 1012644 is about 100.4197026988.

Adding to 1012644 its reverse (4462101), we get a palindrome (5474745).

It can be divided in two parts, 10126 and 44, that multiplied together give a palindrome (445544).

The spelling of 1012644 in words is "one million, twelve thousand, six hundred forty-four".