1864368889 has 2 divisors, whose sum is σ = 1864368890. Its totient is φ = 1864368888.

The previous prime is 1864368871. The next prime is 1864368929. The reversal of 1864368889 is 9888634681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1838694400 + 25674489 = 42880^2 + 5067^2 .

It is a cyclic number.

It is not a de Polignac number, because 1864368889 - 2⁷ = 1864368761 is a prime.

It is not a weakly prime, because it can be changed into another prime (1864368829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932184444 + 932184445.

It is an arithmetic number, because the mean of its divisors is an integer number (932184445).

Almost surely, 2^1864368889 is an apocalyptic number.

It is an amenable number.

1864368889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1864368889 is an equidigital number, since it uses as much as digits as its factorization.

1864368889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15925248, while the sum is 61.

The square root of 1864368889 is about 43178.3381917368. The cubic root of 1864368889 is about 1230.7710786363.

The spelling of 1864368889 in words is "one billion, eight hundred sixty-four million, three hundred sixty-eight thousand, eight hundred eighty-nine".