1393921189 has 2 divisors, whose sum is σ = 1393921190. Its totient is φ = 1393921188.

The previous prime is 1393921183. The next prime is 1393921201. The reversal of 1393921189 is 9811293931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1335902500 + 58018689 = 36550^2 + 7617^2 .

It is a cyclic number.

It is not a de Polignac number, because 1393921189 - 2¹³ = 1393912997 is a prime.

It is a super-2 number, since 2×1393921189² = 3886032562286347442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1393921183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696960594 + 696960595.

It is an arithmetic number, because the mean of its divisors is an integer number (696960595).

Almost surely, 2^1393921189 is an apocalyptic number.

It is an amenable number.

1393921189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1393921189 is an equidigital number, since it uses as much as digits as its factorization.

1393921189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 46.

The square root of 1393921189 is about 37335.2539699411. The cubic root of 1393921189 is about 1117.0674742780.

The spelling of 1393921189 in words is "one billion, three hundred ninety-three million, nine hundred twenty-one thousand, one hundred eighty-nine".