449191920 has 80 divisors (see below), whose sum is σ = 1465799040. Its totient is φ = 113478912.

The previous prime is 449191903. The next prime is 449191921. The reversal of 449191920 is 29191944.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (449191921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44694 + ... + 53813.

It is an arithmetic number, because the mean of its divisors is an integer number (18322488).

Almost surely, 2^449191920 is an apocalyptic number.

449191920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

449191920 is an abundant number, since it is smaller than the sum of its proper divisors (1016607120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

449191920 is a wasteful number, since it uses less digits than its factorization.

449191920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98542 (or 98536 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 449191920 is about 21194.1482489861. The cubic root of 449191920 is about 765.8504617571.

The spelling of 449191920 in words is "four hundred forty-nine million, one hundred ninety-one thousand, nine hundred twenty".