442121929 has 2 divisors, whose sum is σ = 442121930. Its totient is φ = 442121928.

The previous prime is 442121923. The next prime is 442121951. The reversal of 442121929 is 929121244.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244859904 + 197262025 = 15648^2 + 14045^2 .

It is a cyclic number.

It is not a de Polignac number, because 442121929 - 2²¹ = 440024777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 442121894 and 442121903.

It is not a weakly prime, because it can be changed into another prime (442121923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221060964 + 221060965.

It is an arithmetic number, because the mean of its divisors is an integer number (221060965).

Almost surely, 2^442121929 is an apocalyptic number.

It is an amenable number.

442121929 is a deficient number, since it is larger than the sum of its proper divisors (1).

442121929 is an equidigital number, since it uses as much as digits as its factorization.

442121929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 34.

The square root of 442121929 is about 21026.6956272259. The cubic root of 442121929 is about 761.8111978650.

The spelling of 442121929 in words is "four hundred forty-two million, one hundred twenty-one thousand, nine hundred twenty-nine".