1603381 has 8 divisors (see below), whose sum is σ = 1786680. Its totient is φ = 1428672.

The previous prime is 1603363. The next prime is 1603397. The reversal of 1603381 is 1833061.

It can be written as a sum of positive squares in 4 ways, for example, as 625 + 1602756 = 25^2 + 1266^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1603381 - 2⁹ = 1602869 is a prime.

It is a super-2 number, since 2×1603381² = 5141661262322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1603331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1750 + ... + 2503.

It is an arithmetic number, because the mean of its divisors is an integer number (223335).

2^1603381 is an apocalyptic number.

It is an amenable number.

1603381 is a deficient number, since it is larger than the sum of its proper divisors (183299).

1603381 is a wasteful number, since it uses less digits than its factorization.

1603381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4295.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1603381 is about 1266.2468163830. The cubic root of 1603381 is about 117.0430357669.

The spelling of 1603381 in words is "one million, six hundred three thousand, three hundred eighty-one".