1396299991 has 2 divisors, whose sum is σ = 1396299992. Its totient is φ = 1396299990.

The previous prime is 1396299941. The next prime is 1396300001. The reversal of 1396299991 is 1999926931.

It is a strong prime.

It is an emirp because it is prime and its reverse (1999926931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1396299991 - 2¹¹ = 1396297943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1396299941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698149995 + 698149996.

It is an arithmetic number, because the mean of its divisors is an integer number (698149996).

Almost surely, 2^1396299991 is an apocalyptic number.

1396299991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1396299991 is an equidigital number, since it uses as much as digits as its factorization.

1396299991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2125764, while the sum is 58.

The square root of 1396299991 is about 37367.0977064048. The cubic root of 1396299991 is about 1117.7025585271.

The spelling of 1396299991 in words is "one billion, three hundred ninety-six million, two hundred ninety-nine thousand, nine hundred ninety-one".