172420574 has 16 divisors (see below), whose sum is σ = 268171776. Its totient is φ = 83055000.

The previous prime is 172420571. The next prime is 172420609. The reversal of 172420574 is 475024271.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 172420574.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172420571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7949 + ... + 20199.

It is an arithmetic number, because the mean of its divisors is an integer number (16760736).

Almost surely, 2^172420574 is an apocalyptic number.

172420574 is a deficient number, since it is larger than the sum of its proper divisors (95751202).

172420574 is a wasteful number, since it uses less digits than its factorization.

172420574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12511.

The product of its (nonzero) digits is 15680, while the sum is 32.

The square root of 172420574 is about 13130.9014922815. The cubic root of 172420574 is about 556.5826901103.

The spelling of 172420574 in words is "one hundred seventy-two million, four hundred twenty thousand, five hundred seventy-four".