1389503749 has 4 divisors (see below), whose sum is σ = 1413054720. Its totient is φ = 1365952780.

The previous prime is 1389503737. The next prime is 1389503771. The reversal of 1389503749 is 9473059831.

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 not a de Polignac number, because 1389503749 - 2⁹ = 1389503237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389503719) 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, 11775397 + ... + 11775514.

It is an arithmetic number, because the mean of its divisors is an integer number (353263680).

Almost surely, 2^1389503749 is an apocalyptic number.

It is an amenable number.

1389503749 is a deficient number, since it is larger than the sum of its proper divisors (23550971).

1389503749 is an equidigital number, since it uses as much as digits as its factorization.

1389503749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23550970.

The product of its (nonzero) digits is 816480, while the sum is 49.

The square root of 1389503749 is about 37276.0479262488. The cubic root of 1389503749 is about 1115.8862022277.

The spelling of 1389503749 in words is "one billion, three hundred eighty-nine million, five hundred three thousand, seven hundred forty-nine".