1961668 has 6 divisors (see below), whose sum is σ = 3432926. Its totient is φ = 980832.

The previous prime is 1961657. The next prime is 1961669. The reversal of 1961668 is 8661691.

It can be written as a sum of positive squares in only one way, i.e., 1183744 + 777924 = 1088^2 + 882^2 .

It is not an unprimeable number, because it can be changed into a prime (1961669) by changing a digit.

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, 245205 + ... + 245212.

2^1961668 is an apocalyptic number.

It is an amenable number.

1961668 is a deficient number, since it is larger than the sum of its proper divisors (1471258).

1961668 is a wasteful number, since it uses less digits than its factorization.

1961668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490421 (or 490419 counting only the distinct ones).

The product of its digits is 15552, while the sum is 37.

The square root of 1961668 is about 1400.5955875984. The cubic root of 1961668 is about 125.1819855881.

The spelling of 1961668 in words is "one million, nine hundred sixty-one thousand, six hundred sixty-eight".