1012638 has 32 divisors (see below), whose sum is σ = 2252160. Its totient is φ = 300960.

The previous prime is 1012637. The next prime is 1012657. The reversal of 1012638 is 8362101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4308 + ... + 4536.

It is an arithmetic number, because the mean of its divisors is an integer number (70380).

2^1012638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1012638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1126080).

1012638 is an abundant number, since it is smaller than the sum of its proper divisors (1239522).

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

1012638 is a wasteful number, since it uses less digits than its factorization.

1012638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1012638 is about 1006.2991602898. The cubic root of 1012638 is about 100.4195043667.

Adding to 1012638 its reverse (8362101), we get a palindrome (9374739).

The spelling of 1012638 in words is "one million, twelve thousand, six hundred thirty-eight".