1388944213 has 4 divisors (see below), whose sum is σ = 1462046560. Its totient is φ = 1315841868.

The previous prime is 1388944199. The next prime is 1388944229. The reversal of 1388944213 is 3124498831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1388944213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1388944213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388944253) 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, 36551145 + ... + 36551182.

It is an arithmetic number, because the mean of its divisors is an integer number (365511640).

Almost surely, 2^1388944213 is an apocalyptic number.

It is an amenable number.

1388944213 is a deficient number, since it is larger than the sum of its proper divisors (73102347).

1388944213 is an equidigital number, since it uses as much as digits as its factorization.

1388944213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73102346.

The product of its digits is 165888, while the sum is 43.

The square root of 1388944213 is about 37268.5418684445. The cubic root of 1388944213 is about 1115.7363975868.

The spelling of 1388944213 in words is "one billion, three hundred eighty-eight million, nine hundred forty-four thousand, two hundred thirteen".