12539730 has 64 divisors (see below), whose sum is σ = 34679808. Its totient is φ = 2842560.

The previous prime is 12539729. The next prime is 12539743. The reversal of 12539730 is 3793521.

12539730 = 53² + 54² + ... + 335².

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44169 + ... + 44451.

It is an arithmetic number, because the mean of its divisors is an integer number (541872).

Almost surely, 2^12539730 is an apocalyptic number.

12539730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12539730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17339904).

12539730 is an abundant number, since it is smaller than the sum of its proper divisors (22140078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12539730 is a wasteful number, since it uses less digits than its factorization.

12539730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511.

The product of its (nonzero) digits is 5670, while the sum is 30.

The square root of 12539730 is about 3541.1481189016. The cubic root of 12539730 is about 232.3250620700.

The spelling of 12539730 in words is "twelve million, five hundred thirty-nine thousand, seven hundred thirty".