1556940 has 96 divisors (see below), whose sum is σ = 5451264. Its totient is φ = 322560.

The previous prime is 1556927. The next prime is 1556963. The reversal of 1556940 is 496551.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1556898 and 1556907.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4452 + ... + 4788.

It is an arithmetic number, because the mean of its divisors is an integer number (56784).

2^1556940 is an apocalyptic number.

1556940 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 1556940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2725632).

1556940 is an abundant number, since it is smaller than the sum of its proper divisors (3894324).

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

1556940 is a wasteful number, since it uses less digits than its factorization.

1556940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1556940 is about 1247.7740180017. The cubic root of 1556940 is about 115.9019186782.

The spelling of 1556940 in words is "one million, five hundred fifty-six thousand, nine hundred forty".