1661936 has 20 divisors (see below), whose sum is σ = 3240864. Its totient is φ = 825600.

The previous prime is 1661917. The next prime is 1661939. The reversal of 1661936 is 6391661.

1661936 = T₁₃₆ + T₁₃₇ + ... + T₂₃₁.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3641 + ... + 4071.

2^1661936 is an apocalyptic number.

1661936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1661936 is a deficient number, since it is larger than the sum of its proper divisors (1578928).

1661936 is a wasteful number, since it uses less digits than its factorization.

1661936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 674 counting only the distinct ones).

The product of its digits is 5832, while the sum is 32.

The square root of 1661936 is about 1289.1609674513. The cubic root of 1661936 is about 118.4508273374.

The spelling of 1661936 in words is "one million, six hundred sixty-one thousand, nine hundred thirty-six".