449178921 has 24 divisors (see below), whose sum is σ = 660149984. Its totient is φ = 294243840.

The previous prime is 449178893. The next prime is 449178923. The reversal of 449178921 is 129871944.

It is a happy number.

449178921 is a `hidden beast` number, since 4 + 491 + 78 + 92 + 1 = 666.

It is not a de Polignac number, because 449178921 - 2⁵ = 449178889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (449178923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 347286 + ... + 348576.

Almost surely, 2^449178921 is an apocalyptic number.

It is an amenable number.

449178921 is a deficient number, since it is larger than the sum of its proper divisors (210971063).

449178921 is a wasteful number, since it uses less digits than its factorization.

449178921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1941 (or 1938 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 449178921 is about 21193.8415819313. The cubic root of 449178921 is about 765.8430741307.

The spelling of 449178921 in words is "four hundred forty-nine million, one hundred seventy-eight thousand, nine hundred twenty-one".