1561740 has 24 divisors (see below), whose sum is σ = 4373040. Its totient is φ = 416448.

The previous prime is 1561727. The next prime is 1561741. The reversal of 1561740 is 471651.

It is a self number, because there is not a number n which added to its sum of digits gives 1561740.

It is not an unprimeable number, because it can be changed into a prime (1561741) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 12955 + ... + 13074.

It is an arithmetic number, because the mean of its divisors is an integer number (182210).

2^1561740 is an apocalyptic number.

1561740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561740 is an abundant number, since it is smaller than the sum of its proper divisors (2811300).

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

1561740 is a wasteful number, since it uses less digits than its factorization.

1561740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26041 (or 26039 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 1561740 is about 1249.6959630246. The cubic root of 1561740 is about 116.0209038824.

The spelling of 1561740 in words is "one million, five hundred sixty-one thousand, seven hundred forty".