449387981 has 8 divisors (see below), whose sum is σ = 540617280. Its totient is φ = 364916448.

The previous prime is 449387963. The next prime is 449387987. The reversal of 449387981 is 189783944.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-449387981 is a prime.

It is a super-2 number, since 2×449387981² = 403899114934512722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (449387987) 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, 1689296 + ... + 1689561.

It is an arithmetic number, because the mean of its divisors is an integer number (67577160).

Almost surely, 2^449387981 is an apocalyptic number.

It is an amenable number.

449387981 is a deficient number, since it is larger than the sum of its proper divisors (91229299).

449387981 is a wasteful number, since it uses less digits than its factorization.

449387981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378883.

The product of its digits is 1741824, while the sum is 53.

The square root of 449387981 is about 21198.7731012906. The cubic root of 449387981 is about 765.9618703851.

The spelling of 449387981 in words is "four hundred forty-nine million, three hundred eighty-seven thousand, nine hundred eighty-one".