1389890745 has 24 divisors (see below), whose sum is σ = 2498373696. Its totient is φ = 741274416.

The previous prime is 1389890741. The next prime is 1389890753. The reversal of 1389890745 is 5470989831.

It is not a de Polignac number, because 1389890745 - 2² = 1389890741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1389890691 and 1389890700.

It is not an unprimeable number, because it can be changed into a prime (1389890741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 570757 + ... + 573186.

It is an arithmetic number, because the mean of its divisors is an integer number (104098904).

Almost surely, 2^1389890745 is an apocalyptic number.

1389890745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1389890745 is a deficient number, since it is larger than the sum of its proper divisors (1108482951).

1389890745 is an equidigital number, since it uses as much as digits as its factorization.

1389890745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143963 (or 1143951 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The square root of 1389890745 is about 37281.2385121525. The cubic root of 1389890745 is about 1115.9897891886.

The spelling of 1389890745 in words is "one billion, three hundred eighty-nine million, eight hundred ninety thousand, seven hundred forty-five".