1051638 has 40 divisors (see below), whose sum is σ = 2487288. Its totient is φ = 296352.

The previous prime is 1051621. The next prime is 1051639. The reversal of 1051638 is 8361501.

It is a super-2 number, since 2×1051638² = 2211884966088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051639) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14370 + ... + 14442.

2^1051638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1051638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1243644).

1051638 is an abundant number, since it is smaller than the sum of its proper divisors (1435650).

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

1051638 is an frugal number, since it uses more digits than its factorization.

1051638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1051638 is about 1025.4940272864. The cubic root of 1051638 is about 101.6924608325.

The spelling of 1051638 in words is "one million, fifty-one thousand, six hundred thirty-eight".