8172405 has 12 divisors (see below), whose sum is σ = 14165580. Its totient is φ = 4358592.

The previous prime is 8172391. The next prime is 8172419. The reversal of 8172405 is 5042718.

It is an interprime number because it is at equal distance from previous prime (8172391) and next prime (8172419).

It can be written as a sum of positive squares in 2 ways, for example, as 3837681 + 4334724 = 1959^2 + 2082^2 .

It is not a de Polignac number, because 8172405 - 2⁴ = 8172389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90760 + ... + 90849.

It is an arithmetic number, because the mean of its divisors is an integer number (1180465).

Almost surely, 2^8172405 is an apocalyptic number.

It is an amenable number.

8172405 is a deficient number, since it is larger than the sum of its proper divisors (5993175).

8172405 is a wasteful number, since it uses less digits than its factorization.

8172405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181620 (or 181617 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 8172405 is about 2858.7418561318. The cubic root of 8172405 is about 201.4265094962.

The spelling of 8172405 in words is "eight million, one hundred seventy-two thousand, four hundred five".