13709825 has 6 divisors (see below), whose sum is σ = 17000214. Its totient is φ = 10967840.

The previous prime is 13709809. The next prime is 13709831. The reversal of 13709825 is 52890731.

13709825 = 390² + 391² + ... + 464².

It can be written as a sum of positive squares in 3 ways, for example, as 78961 + 13630864 = 281^2 + 3692^2 .

It is not a de Polignac number, because 13709825 - 2⁴ = 13709809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 274172 + ... + 274221.

It is an arithmetic number, because the mean of its divisors is an integer number (2833369).

Almost surely, 2^13709825 is an apocalyptic number.

It is an amenable number.

13709825 is a deficient number, since it is larger than the sum of its proper divisors (3290389).

13709825 is an equidigital number, since it uses as much as digits as its factorization.

13709825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548403 (or 548398 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 13709825 is about 3702.6780848462. The cubic root of 13709825 is about 239.3374376090.

The spelling of 13709825 in words is "thirteen million, seven hundred nine thousand, eight hundred twenty-five".