1386364891 has 4 divisors (see below), whose sum is σ = 1389857392. Its totient is φ = 1382872392.

The previous prime is 1386364843. The next prime is 1386364901. The reversal of 1386364891 is 1984636831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1386364891 is a prime.

It is a super-2 number, since 2×1386364891² = 3844015221994883762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1386364801) 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, 1745655 + ... + 1746448.

It is an arithmetic number, because the mean of its divisors is an integer number (347464348).

Almost surely, 2^1386364891 is an apocalyptic number.

1386364891 is a deficient number, since it is larger than the sum of its proper divisors (3492501).

1386364891 is an equidigital number, since it uses as much as digits as its factorization.

1386364891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3492500.

The product of its digits is 746496, while the sum is 49.

The square root of 1386364891 is about 37233.9212412553. The cubic root of 1386364891 is about 1115.0453147074.

The spelling of 1386364891 in words is "one billion, three hundred eighty-six million, three hundred sixty-four thousand, eight hundred ninety-one".