1964861 has 2 divisors, whose sum is σ = 1964862. Its totient is φ = 1964860.

The previous prime is 1964857. The next prime is 1964881. The reversal of 1964861 is 1684691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1932100 + 32761 = 1390^2 + 181^2 .

It is an emirp because it is prime and its reverse (1684691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1964861 - 2² = 1964857 is a prime.

It is a Chen prime.

It is a plaindrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1964801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982430 + 982431.

It is an arithmetic number, because the mean of its divisors is an integer number (982431).

2^1964861 is an apocalyptic number.

It is an amenable number.

1964861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1964861 is an equidigital number, since it uses as much as digits as its factorization.

1964861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 1964861 is about 1401.7349963527. The cubic root of 1964861 is about 125.2498681943.

The spelling of 1964861 in words is "one million, nine hundred sixty-four thousand, eight hundred sixty-one".