1638072 has 24 divisors (see below), whose sum is σ = 4436640. Its totient is φ = 546000.

The previous prime is 1638067. The next prime is 1638089. The reversal of 1638072 is 2708361.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11304 + ... + 11447.

It is an arithmetic number, because the mean of its divisors is an integer number (184860).

2^1638072 is an apocalyptic number.

1638072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1638072 is an abundant number, since it is smaller than the sum of its proper divisors (2798568).

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

1638072 is a wasteful number, since it uses less digits than its factorization.

1638072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22763 (or 22756 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1638072 is about 1279.8718685869. The cubic root of 1638072 is about 117.8811404892.

The spelling of 1638072 in words is "one million, six hundred thirty-eight thousand, seventy-two".