442121928 has 32 divisors (see below), whose sum is σ = 1124042400. Its totient is φ = 144875648.

The previous prime is 442121923. The next prime is 442121929. The reversal of 442121928 is 829121244.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (442121923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154701 + ... + 157532.

It is an arithmetic number, because the mean of its divisors is an integer number (35126325).

Almost surely, 2^442121928 is an apocalyptic number.

It is an amenable number.

442121928 is an abundant number, since it is smaller than the sum of its proper divisors (681920472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

442121928 is a wasteful number, since it uses less digits than its factorization.

442121928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312301 (or 312297 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 442121928 is about 21026.6956034466. The cubic root of 442121928 is about 761.8111972907.

The spelling of 442121928 in words is "four hundred forty-two million, one hundred twenty-one thousand, nine hundred twenty-eight".