442157945 has 4 divisors (see below), whose sum is σ = 530589540. Its totient is φ = 353726352.

The previous prime is 442157941. The next prime is 442157953. The reversal of 442157945 is 549751244.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88868329 + 353289616 = 9427^2 + 18796^2 .

It is a cyclic number.

It is not a de Polignac number, because 442157945 - 2² = 442157941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (442157941) 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 3 ways as a sum of consecutive naturals, for example, 44215790 + ... + 44215799.

It is an arithmetic number, because the mean of its divisors is an integer number (132647385).

Almost surely, 2^442157945 is an apocalyptic number.

It is an amenable number.

442157945 is a deficient number, since it is larger than the sum of its proper divisors (88431595).

442157945 is an equidigital number, since it uses as much as digits as its factorization.

442157945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88431594.

The product of its digits is 201600, while the sum is 41.

The square root of 442157945 is about 21027.5520448767. The cubic root of 442157945 is about 761.8318834462.

The spelling of 442157945 in words is "four hundred forty-two million, one hundred fifty-seven thousand, nine hundred forty-five".