1963661 has 8 divisors (see below), whose sum is σ = 2259264. Its totient is φ = 1671840.

The previous prime is 1963657. The next prime is 1963667. The reversal of 1963661 is 1663691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1963661 - 2² = 1963657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1963667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281 + ... + 2001.

It is an arithmetic number, because the mean of its divisors is an integer number (282408).

2^1963661 is an apocalyptic number.

It is an amenable number.

1963661 is a deficient number, since it is larger than the sum of its proper divisors (295603).

1963661 is a wasteful number, since it uses less digits than its factorization.

1963661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891.

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

The square root of 1963661 is about 1401.3068900137. The cubic root of 1963661 is about 125.2243650417.

The spelling of 1963661 in words is "one million, nine hundred sixty-three thousand, six hundred sixty-one".