1394248991 has 4 divisors (see below), whose sum is σ = 1409914800. Its totient is φ = 1378583184.

The previous prime is 1394248981. The next prime is 1394249011. The reversal of 1394248991 is 1998424931.

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

It is a cyclic number.

It is not a de Polignac number, because 1394248991 - 2²⁶ = 1327140127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1394248951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7832771 + ... + 7832948.

It is an arithmetic number, because the mean of its divisors is an integer number (352478700).

Almost surely, 2^1394248991 is an apocalyptic number.

1394248991 is a deficient number, since it is larger than the sum of its proper divisors (15665809).

1394248991 is an equidigital number, since it uses as much as digits as its factorization.

1394248991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15665808.

The product of its digits is 559872, while the sum is 50.

The square root of 1394248991 is about 37339.6436913905. The cubic root of 1394248991 is about 1117.1550326122.

The spelling of 1394248991 in words is "one billion, three hundred ninety-four million, two hundred forty-eight thousand, nine hundred ninety-one".