13439780 has 24 divisors (see below), whose sum is σ = 28297080. Its totient is φ = 5361920.

The previous prime is 13439773. The next prime is 13439807. The reversal of 13439780 is 8793431.

It can be written as a sum of positive squares in 4 ways, for example, as 1893376 + 11546404 = 1376^2 + 3398^2 .

It is a super-4 number, since 4×13439780⁴ (a number of 30 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13439780.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10790 + ... + 11970.

It is an arithmetic number, because the mean of its divisors is an integer number (1179045).

Almost surely, 2^13439780 is an apocalyptic number.

13439780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13439780 is an abundant number, since it is smaller than the sum of its proper divisors (14857300).

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

13439780 is a wasteful number, since it uses less digits than its factorization.

13439780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759 (or 1757 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 13439780 is about 3666.0305508820. The cubic root of 13439780 is about 237.7555808189.

The spelling of 13439780 in words is "thirteen million, four hundred thirty-nine thousand, seven hundred eighty".