1389508436 has 18 divisors (see below), whose sum is σ = 2516216430. Its totient is φ = 670603360.

The previous prime is 1389508433. The next prime is 1389508441. The reversal of 1389508436 is 6348059831.

It can be written as a sum of positive squares in 3 ways, for example, as 8940100 + 1380568336 = 2990^2 + 37156^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389508433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 399746 + ... + 403206.

Almost surely, 2^1389508436 is an apocalyptic number.

It is an amenable number.

1389508436 is a deficient number, since it is larger than the sum of its proper divisors (1126707994).

1389508436 is an frugal number, since it uses more digits than its factorization.

1389508436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6955 (or 3492 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 47.

The square root of 1389508436 is about 37276.1107949850. The cubic root of 1389508436 is about 1115.8874569089.

The spelling of 1389508436 in words is "one billion, three hundred eighty-nine million, five hundred eight thousand, four hundred thirty-six".