1603640 has 32 divisors (see below), whose sum is σ = 3689280. Its totient is φ = 627072.

The previous prime is 1603631. The next prime is 1603649. The reversal of 1603640 is 463061.

It is an interprime number because it is at equal distance from previous prime (1603631) and next prime (1603649).

It is a super-2 number, since 2×1603640² = 5143322499200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1603649) 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, 1454 + ... + 2306.

It is an arithmetic number, because the mean of its divisors is an integer number (115290).

2^1603640 is an apocalyptic number.

1603640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1603640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1844640).

1603640 is an abundant number, since it is smaller than the sum of its proper divisors (2085640).

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

1603640 is a wasteful number, since it uses less digits than its factorization.

1603640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911 (or 907 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1603640 is about 1266.3490829941. The cubic root of 1603640 is about 117.0493375576.

The spelling of 1603640 in words is "one million, six hundred three thousand, six hundred forty".