1964881 has 2 divisors, whose sum is σ = 1964882. Its totient is φ = 1964880.

The previous prime is 1964861. The next prime is 1964887. The reversal of 1964881 is 1884691.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1918225 + 46656 = 1385^2 + 216^2 .

It is a cyclic number.

It is not a de Polignac number, because 1964881 - 2⁵ = 1964849 is a prime.

It is a super-2 number, since 2×1964881² = 7721514688322, which contains 22 as substring.

1964881 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1964881.

It is not a weakly prime, because it can be changed into another prime (1964887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982440 + 982441.

It is an arithmetic number, because the mean of its divisors is an integer number (982441).

2^1964881 is an apocalyptic number.

It is an amenable number.

1964881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1964881 is an equidigital number, since it uses as much as digits as its factorization.

1964881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 37.

The square root of 1964881 is about 1401.7421303507. The cubic root of 1964881 is about 125.2502931588.

The spelling of 1964881 in words is "one million, nine hundred sixty-four thousand, eight hundred eighty-one".