172720934 has 4 divisors (see below), whose sum is σ = 259081404. Its totient is φ = 86360466.

The previous prime is 172720927. The next prime is 172720957. The reversal of 172720934 is 439027271.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 172720894 and 172720903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43180232 + ... + 43180235.

It is an arithmetic number, because the mean of its divisors is an integer number (64770351).

Almost surely, 2^172720934 is an apocalyptic number.

172720934 is a deficient number, since it is larger than the sum of its proper divisors (86360470).

172720934 is an equidigital number, since it uses as much as digits as its factorization.

172720934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86360469.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 172720934 is about 13142.3336588294. Note that the first 3 decimals coincide. The cubic root of 172720934 is about 556.9056952534.

The spelling of 172720934 in words is "one hundred seventy-two million, seven hundred twenty thousand, nine hundred thirty-four".