1090638 has 32 divisors (see below), whose sum is σ = 2553600. Its totient is φ = 344088.

The previous prime is 1090627. The next prime is 1090681. The reversal of 1090638 is 8360901.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 495 + ... + 1557.

It is an arithmetic number, because the mean of its divisors is an integer number (79800).

2^1090638 is an apocalyptic number.

1090638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1090638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1276800).

1090638 is an abundant number, since it is smaller than the sum of its proper divisors (1462962).

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

1090638 is a wasteful number, since it uses less digits than its factorization.

1090638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093 (or 1087 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1090638 is about 1044.3361527784. The cubic root of 1090638 is about 102.9343220342.

It can be divided in two parts, 1090 and 638, that added together give a cube (1728 = 12³).

The spelling of 1090638 in words is "one million, ninety thousand, six hundred thirty-eight".