442172638 has 16 divisors (see below), whose sum is σ = 672557760. Its totient is φ = 217994400.

The previous prime is 442172629. The next prime is 442172641. The reversal of 442172638 is 836271244.

It is a junction number, because it is equal to n+sod(n) for n = 442172597 and 442172606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159948 + ... + 162688.

It is an arithmetic number, because the mean of its divisors is an integer number (42034860).

Almost surely, 2^442172638 is an apocalyptic number.

442172638 is a deficient number, since it is larger than the sum of its proper divisors (230385122).

442172638 is a wasteful number, since it uses less digits than its factorization.

442172638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3843.

The product of its digits is 64512, while the sum is 37.

The square root of 442172638 is about 21027.9014169270. The cubic root of 442172638 is about 761.8403219631.

The spelling of 442172638 in words is "four hundred forty-two million, one hundred seventy-two thousand, six hundred thirty-eight".