442613981 has 4 divisors (see below), whose sum is σ = 444178272. Its totient is φ = 441049692.

The previous prime is 442613957. The next prime is 442614019. The reversal of 442613981 is 189316244.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 442613981 - 2⁶ = 442613917 is a prime.

It is a super-2 number, since 2×442613981² = 391814272353336722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442615981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781721 + ... + 782286.

It is an arithmetic number, because the mean of its divisors is an integer number (111044568).

Almost surely, 2^442613981 is an apocalyptic number.

It is an amenable number.

442613981 is a deficient number, since it is larger than the sum of its proper divisors (1564291).

442613981 is a wasteful number, since it uses less digits than its factorization.

442613981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564290.

The product of its digits is 41472, while the sum is 38.

The square root of 442613981 is about 21038.3930232325. The cubic root of 442613981 is about 762.0937079779.

The spelling of 442613981 in words is "four hundred forty-two million, six hundred thirteen thousand, nine hundred eighty-one".