1393085991 has 8 divisors (see below), whose sum is σ = 2026306944. Its totient is φ = 844294520.

The previous prime is 1393085983. The next prime is 1393085999. The reversal of 1393085991 is 1995803931.

It is an interprime number because it is at equal distance from previous prime (1393085983) and next prime (1393085999).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1393085991 - 2³ = 1393085983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1393085991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1393085999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21107331 + ... + 21107396.

It is an arithmetic number, because the mean of its divisors is an integer number (253288368).

Almost surely, 2^1393085991 is an apocalyptic number.

1393085991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1393085991 is a deficient number, since it is larger than the sum of its proper divisors (633220953).

1393085991 is a wasteful number, since it uses less digits than its factorization.

1393085991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42214741.

The product of its (nonzero) digits is 262440, while the sum is 48.

The square root of 1393085991 is about 37324.0671819136. The cubic root of 1393085991 is about 1116.8443246656.

The spelling of 1393085991 in words is "one billion, three hundred ninety-three million, eighty-five thousand, nine hundred ninety-one".