1661536 has 24 divisors (see below), whose sum is σ = 3303720. Its totient is φ = 822528.

The previous prime is 1661519. The next prime is 1661549. The reversal of 1661536 is 6351661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4195 + ... + 4573.

It is an arithmetic number, because the mean of its divisors is an integer number (137655).

2^1661536 is an apocalyptic number.

1661536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1661536 is a deficient number, since it is larger than the sum of its proper divisors (1642184).

1661536 is a wasteful number, since it uses less digits than its factorization.

1661536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526 (or 518 counting only the distinct ones).

The product of its digits is 3240, while the sum is 28.

The square root of 1661536 is about 1289.0058184508. The cubic root of 1661536 is about 118.4413235353.

It can be divided in two parts, 1661 and 536, that added together give a cube (2197 = 13³).

The spelling of 1661536 in words is "one million, six hundred sixty-one thousand, five hundred thirty-six".