172344385 has 16 divisors (see below), whose sum is σ = 219327696. Its totient is φ = 129558528.

The previous prime is 172344379. The next prime is 172344391. The reversal of 172344385 is 583443271.

It is a happy number.

It is a Cunningham number, because it is equal to 13128²+1.

It is an interprime number because it is at equal distance from previous prime (172344379) and next prime (172344391).

It can be written as a sum of positive squares in 8 ways, for example, as 10316944 + 162027441 = 3212^2 + 12729^2 .

It is a cyclic number.

It is not a de Polignac number, because 172344385 - 2³ = 172344377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71317 + ... + 73693.

It is an arithmetic number, because the mean of its divisors is an integer number (13707981).

Almost surely, 2^172344385 is an apocalyptic number.

It is an amenable number.

172344385 is a deficient number, since it is larger than the sum of its proper divisors (46983311).

172344385 is a wasteful number, since it uses less digits than its factorization.

172344385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3252.

The product of its digits is 80640, while the sum is 37.

The square root of 172344385 is about 13128.0000380865. Note that the first 4 decimals coincide. The cubic root of 172344385 is about 556.5006973312.

The spelling of 172344385 in words is "one hundred seventy-two million, three hundred forty-four thousand, three hundred eighty-five".