1638896 has 20 divisors (see below), whose sum is σ = 3629232. Its totient is φ = 702336.

The previous prime is 1638869. The next prime is 1638899. The reversal of 1638896 is 6988361.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7205 + ... + 7428.

2^1638896 is an apocalyptic number.

1638896 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1638896 is an abundant number, since it is smaller than the sum of its proper divisors (1990336).

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

1638896 is a wasteful number, since it uses less digits than its factorization.

1638896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14648 (or 14642 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 1638896 is about 1280.1937353385. The cubic root of 1638896 is about 117.9009031079.

The spelling of 1638896 in words is "one million, six hundred thirty-eight thousand, eight hundred ninety-six".