1638480 has 40 divisors (see below), whose sum is σ = 5080032. Its totient is φ = 436864.

The previous prime is 1638473. The next prime is 1638487. The reversal of 1638480 is 848361.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1638473) and next prime (1638487).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3174 + ... + 3653.

2^1638480 is an apocalyptic number.

1638480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1638480 is an abundant number, since it is smaller than the sum of its proper divisors (3441552).

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

1638480 is a wasteful number, since it uses less digits than its factorization.

1638480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6843 (or 6837 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 1638480 is about 1280.0312496185. The cubic root of 1638480 is about 117.8909266917.

The spelling of 1638480 in words is "one million, six hundred thirty-eight thousand, four hundred eighty".