1393969858 has 4 divisors (see below), whose sum is σ = 2090954790. Its totient is φ = 696984928.

The previous prime is 1393969747. The next prime is 1393969933. The reversal of 1393969858 is 8589693931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1291899249 + 102070609 = 35943^2 + 10103^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1393969796 and 1393969805.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348492463 + ... + 348492466.

Almost surely, 2^1393969858 is an apocalyptic number.

1393969858 is a deficient number, since it is larger than the sum of its proper divisors (696984932).

1393969858 is an equidigital number, since it uses as much as digits as its factorization.

1393969858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696984931.

The product of its digits is 12597120, while the sum is 61.

The square root of 1393969858 is about 37335.9057476848. The cubic root of 1393969858 is about 1117.0804749949.

The spelling of 1393969858 in words is "one billion, three hundred ninety-three million, nine hundred sixty-nine thousand, eight hundred fifty-eight".