1561964 has 6 divisors (see below), whose sum is σ = 2733444. Its totient is φ = 780980.

The previous prime is 1561919. The next prime is 1562051. The reversal of 1561964 is 4691651.

It is a self number, because there is not a number n which added to its sum of digits gives 1561964.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195242 + ... + 195249.

It is an arithmetic number, because the mean of its divisors is an integer number (455574).

2^1561964 is an apocalyptic number.

It is an amenable number.

1561964 is a deficient number, since it is larger than the sum of its proper divisors (1171480).

1561964 is a wasteful number, since it uses less digits than its factorization.

1561964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390495 (or 390493 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 1561964 is about 1249.7855816099. The cubic root of 1561964 is about 116.0264505675.

The spelling of 1561964 in words is "one million, five hundred sixty-one thousand, nine hundred sixty-four".