13120405 has 8 divisors (see below), whose sum is σ = 15900984. Its totient is φ = 10392000.

The previous prime is 13120351. The next prime is 13120411. The reversal of 13120405 is 50402131.

It can be written as a sum of positive squares in 4 ways, for example, as 4588164 + 8532241 = 2142^2 + 2921^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13120405 - 2²¹ = 11023253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12486 + ... + 13495.

It is an arithmetic number, because the mean of its divisors is an integer number (1987623).

Almost surely, 2^13120405 is an apocalyptic number.

It is an amenable number.

13120405 is a deficient number, since it is larger than the sum of its proper divisors (2780579).

13120405 is a wasteful number, since it uses less digits than its factorization.

13120405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26087.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 13120405 is about 3622.2099607836. The cubic root of 13120405 is about 235.8571684328.

Adding to 13120405 its reverse (50402131), we get a palindrome (63522536).

The spelling of 13120405 in words is "thirteen million, one hundred twenty thousand, four hundred five".