1393039861 has 2 divisors, whose sum is σ = 1393039862. Its totient is φ = 1393039860.

The previous prime is 1393039849. The next prime is 1393039897. The reversal of 1393039861 is 1689303931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 918453636 + 474586225 = 30306^2 + 21785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1393039861 - 2⁵ = 1393039829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1393039811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696519930 + 696519931.

It is an arithmetic number, because the mean of its divisors is an integer number (696519931).

Almost surely, 2^1393039861 is an apocalyptic number.

It is an amenable number.

1393039861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1393039861 is an equidigital number, since it uses as much as digits as its factorization.

1393039861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 1393039861 is about 37323.4492109183. The cubic root of 1393039861 is about 1116.8319969754.

The spelling of 1393039861 in words is "one billion, three hundred ninety-three million, thirty-nine thousand, eight hundred sixty-one".