12739545 has 128 divisors (see below), whose sum is σ = 29998080. Its totient is φ = 4976640.

The previous prime is 12739537. The next prime is 12739577. The reversal of 12739545 is 54593721.

12739545 = 196² + 197² + ... + 357².

12739545 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12739545 - 2³ = 12739537 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 208815 + ... + 208875.

It is an arithmetic number, because the mean of its divisors is an integer number (234360).

Almost surely, 2^12739545 is an apocalyptic number.

12739545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12739545 is the 1785-th decagonal number.

It is an amenable number.

12739545 is an abundant number, since it is smaller than the sum of its proper divisors (17258535).

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

12739545 is a wasteful number, since it uses less digits than its factorization.

12739545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 106 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 12739545 is about 3569.2499212019. The cubic root of 12739545 is about 233.5525637968.

The spelling of 12739545 in words is "twelve million, seven hundred thirty-nine thousand, five hundred forty-five".