107521405 has 8 divisors (see below), whose sum is σ = 129096792. Its totient is φ = 85969728.

The previous prime is 107521397. The next prime is 107521429. The reversal of 107521405 is 504125701.

It can be written as a sum of positive squares in 4 ways, for example, as 59814756 + 47706649 = 7734^2 + 6907^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 107521405 - 2³ = 107521397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 107521405.

It is a congruent number.

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, 6379 + ... + 15991.

It is an arithmetic number, because the mean of its divisors is an integer number (16137099).

Almost surely, 2^107521405 is an apocalyptic number.

It is an amenable number.

107521405 is a deficient number, since it is larger than the sum of its proper divisors (21575387).

107521405 is an equidigital number, since it uses as much as digits as its factorization.

107521405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11855.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 107521405 is about 10369.2528660458. The cubic root of 107521405 is about 475.5158274448.

The spelling of 107521405 in words is "one hundred seven million, five hundred twenty-one thousand, four hundred five".