1964381 has 2 divisors, whose sum is σ = 1964382. Its totient is φ = 1964380.

The previous prime is 1964363. The next prime is 1964387. The reversal of 1964381 is 1834691.

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., 1092025 + 872356 = 1045^2 + 934^2 .

It is a cyclic number.

It is not a de Polignac number, because 1964381 - 2⁶ = 1964317 is a prime.

It is a super-2 number, since 2×1964381² = 7717585426322, which contains 22 as substring.

It is a Chen prime.

It is equal to p₁₄₆₄₈₉ and since 1964381 and 146489 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1964387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982190 + 982191.

It is an arithmetic number, because the mean of its divisors is an integer number (982191).

2^1964381 is an apocalyptic number.

It is an amenable number.

1964381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1964381 is an equidigital number, since it uses as much as digits as its factorization.

1964381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 1964381 is about 1401.5637695089. The cubic root of 1964381 is about 125.2396681796.

The spelling of 1964381 in words is "one million, nine hundred sixty-four thousand, three hundred eighty-one".