1603881 has 10 divisors (see below), whose sum is σ = 2396042. Its totient is φ = 1069200.

The previous prime is 1603871. The next prime is 1603891. The reversal of 1603881 is 1883061.

It is an interprime number because it is at equal distance from previous prime (1603871) and next prime (1603891).

It can be written as a sum of positive squares in only one way, i.e., 810000 + 793881 = 900^2 + 891^2 .

It is not a de Polignac number, because 1603881 - 2⁶ = 1603817 is a prime.

It is a super-2 number, since 2×1603881² = 5144868524322, which contains 22 as substring.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1603801) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 9820 + ... + 9981.

2^1603881 is an apocalyptic number.

It is an amenable number.

1603881 is a deficient number, since it is larger than the sum of its proper divisors (792161).

1603881 is an equidigital number, since it uses as much as digits as its factorization.

1603881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19813 (or 19804 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1603881 is about 1266.4442348560. Note that the first 3 decimals coincide. The cubic root of 1603881 is about 117.0552007766.

The spelling of 1603881 in words is "one million, six hundred three thousand, eight hundred eighty-one".