1389249089 has 4 divisors (see below), whose sum is σ = 1437154260. Its totient is φ = 1341343920.

The previous prime is 1389249083. The next prime is 1389249133. The reversal of 1389249089 is 9809429831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9809429831 = 47 ⋅208711273.

It can be written as a sum of positive squares in 2 ways, for example, as 1187836225 + 201412864 = 34465^2 + 14192^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389249089 - 2¹² = 1389244993 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 1389249089.

It is not an unprimeable number, because it can be changed into a prime (1389249083) 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, 23952542 + ... + 23952599.

It is an arithmetic number, because the mean of its divisors is an integer number (359288565).

Almost surely, 2^1389249089 is an apocalyptic number.

It is an amenable number.

1389249089 is a deficient number, since it is larger than the sum of its proper divisors (47905171).

1389249089 is an equidigital number, since it uses as much as digits as its factorization.

1389249089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47905170.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The square root of 1389249089 is about 37272.6319033148. The cubic root of 1389249089 is about 1115.8180270626.

The spelling of 1389249089 in words is "one billion, three hundred eighty-nine million, two hundred forty-nine thousand, eighty-nine".