1081638 has 12 divisors (see below), whose sum is σ = 2343588. Its totient is φ = 360540.

The previous prime is 1081637. The next prime is 1081657. The reversal of 1081638 is 8361801.

1081638 = 187² + 188² + ... + 213².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30028 + ... + 30063.

It is an arithmetic number, because the mean of its divisors is an integer number (195299).

2^1081638 is an apocalyptic number.

1081638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1081638 is an abundant number, since it is smaller than the sum of its proper divisors (1261950).

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

1081638 is a wasteful number, since it uses less digits than its factorization.

1081638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60099 (or 60096 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1081638 is about 1040.0182690703. The cubic root of 1081638 is about 102.6503998703.

The spelling of 1081638 in words is "one million, eighty-one thousand, six hundred thirty-eight".