1561996 has 6 divisors (see below), whose sum is σ = 2733500. Its totient is φ = 780996.

The previous prime is 1561919. The next prime is 1562051. The reversal of 1561996 is 6991651.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195246 + ... + 195253.

2^1561996 is an apocalyptic number.

It is an amenable number.

1561996 is a deficient number, since it is larger than the sum of its proper divisors (1171504).

1561996 is a wasteful number, since it uses less digits than its factorization.

1561996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390503 (or 390501 counting only the distinct ones).

The product of its digits is 14580, while the sum is 37.

The square root of 1561996 is about 1249.7983837404. The cubic root of 1561996 is about 116.0272429078.

The spelling of 1561996 in words is "one million, five hundred sixty-one thousand, nine hundred ninety-six".