172020842 has 16 divisors (see below), whose sum is σ = 296073792. Its totient is φ = 73428000.

The previous prime is 172020811. The next prime is 172020847. The reversal of 172020842 is 248020271.

It is not an unprimeable number, because it can be changed into a prime (172020847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20963 + ... + 27990.

It is an arithmetic number, because the mean of its divisors is an integer number (18504612).

Almost surely, 2^172020842 is an apocalyptic number.

172020842 is a deficient number, since it is larger than the sum of its proper divisors (124052950).

172020842 is a wasteful number, since it uses less digits than its factorization.

172020842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49213.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 172020842 is about 13115.6716183351. The cubic root of 172020842 is about 556.1522386457.

The spelling of 172020842 in words is "one hundred seventy-two million, twenty thousand, eight hundred forty-two".