1603872 has 36 divisors (see below), whose sum is σ = 4561830. Its totient is φ = 534528.

The previous prime is 1603871. The next prime is 1603891. The reversal of 1603872 is 2783061.

It can be written as a sum of positive squares in only one way, i.e., 1527696 + 76176 = 1236^2 + 276^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an Ulam number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (1603871) 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, 2497 + ... + 3072.

2^1603872 is an apocalyptic number.

1603872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1603872 is an abundant number, since it is smaller than the sum of its proper divisors (2957958).

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

1603872 is a wasteful number, since it uses less digits than its factorization.

1603872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5585 (or 5574 counting only the distinct ones).

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

The square root of 1603872 is about 1266.4406815955. The cubic root of 1603872 is about 117.0549818287.

It can be divided in two parts, 16038 and 72, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 1603872 in words is "one million, six hundred three thousand, eight hundred seventy-two".