1398033866 has 4 divisors (see below), whose sum is σ = 2097050802. Its totient is φ = 699016932.

The previous prime is 1398033809. The next prime is 1398033869. The reversal of 1398033866 is 6683308931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6683308931 = 13 ⋅514100687.

It can be written as a sum of positive squares in only one way, i.e., 1397638225 + 395641 = 37385^2 + 629^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1398033866.

It is not an unprimeable number, because it can be changed into a prime (1398033869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349508465 + ... + 349508468.

Almost surely, 2^1398033866 is an apocalyptic number.

1398033866 is a deficient number, since it is larger than the sum of its proper divisors (699016936).

1398033866 is an equidigital number, since it uses as much as digits as its factorization.

1398033866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699016935.

The product of its (nonzero) digits is 559872, while the sum is 47.

The square root of 1398033866 is about 37390.2910659973. The cubic root of 1398033866 is about 1118.1650080789.

The spelling of 1398033866 in words is "one billion, three hundred ninety-eight million, thirty-three thousand, eight hundred sixty-six".