1556730 has 72 divisors (see below), whose sum is σ = 4721652. Its totient is φ = 354816.

The previous prime is 1556719. The next prime is 1556747. The reversal of 1556730 is 376551.

1556730 is a nontrivial binomial coefficient, being equal to C(1765, 2).

It can be written as a sum of positive squares in 2 ways, for example, as 1535121 + 21609 = 1239^2 + 147^2 .

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 1556694 and 1556703.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4234 + ... + 4586.

2^1556730 is an apocalyptic number.

1556730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1556730 is the 1764-th triangular number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1556730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2360826).

1556730 is an abundant number, since it is smaller than the sum of its proper divisors (3164922).

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

1556730 is a wasteful number, since it uses less digits than its factorization.

1556730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 27.

The square root of 1556730 is about 1247.6898653111. The cubic root of 1556730 is about 115.8967074953.

The spelling of 1556730 in words is "one million, five hundred fifty-six thousand, seven hundred thirty".