173640381 has 4 divisors (see below), whose sum is σ = 231520512. Its totient is φ = 115760252.

The previous prime is 173640377. The next prime is 173640391. The reversal of 173640381 is 183046371.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183046371 = 3 ⋅61015457.

It is a cyclic number.

It is not a de Polignac number, because 173640381 - 2² = 173640377 is a prime.

It is a super-2 number, since 2×173640381² = 60301963827650322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173640301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28940061 + ... + 28940066.

It is an arithmetic number, because the mean of its divisors is an integer number (57880128).

Almost surely, 2^173640381 is an apocalyptic number.

It is an amenable number.

173640381 is a deficient number, since it is larger than the sum of its proper divisors (57880131).

173640381 is an equidigital number, since it uses as much as digits as its factorization.

173640381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57880130.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 173640381 is about 13177.2675847461. The cubic root of 173640381 is about 557.8921407384.

The spelling of 173640381 in words is "one hundred seventy-three million, six hundred forty thousand, three hundred eighty-one".