444992681 has 8 divisors (see below), whose sum is σ = 520390464. Its totient is φ = 372551760.

The previous prime is 444992677. The next prime is 444992687. The reversal of 444992681 is 186299444.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 444992681 - 2² = 444992677 is a prime.

It is a super-2 number, since 2×444992681² = 396036972287135522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (444992687) 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, 738890 + ... + 739491.

It is an arithmetic number, because the mean of its divisors is an integer number (65048808).

Almost surely, 2^444992681 is an apocalyptic number.

It is an amenable number.

444992681 is a deficient number, since it is larger than the sum of its proper divisors (75397783).

444992681 is a wasteful number, since it uses less digits than its factorization.

444992681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478431.

The product of its digits is 497664, while the sum is 47.

The square root of 444992681 is about 21094.8496320784. The cubic root of 444992681 is about 763.4564865318.

The spelling of 444992681 in words is "four hundred forty-four million, nine hundred ninety-two thousand, six hundred eighty-one".