1449721920 has 224 divisors, whose sum is σ = 4908352896. Its totient is φ = 361267200.

The previous prime is 1449721883. The next prime is 1449721927. The reversal of 1449721920 is 291279441.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1449721927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3443310 + ... + 3443730.

Almost surely, 2^1449721920 is an apocalyptic number.

1449721920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1449721920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2454176448).

1449721920 is an abundant number, since it is smaller than the sum of its proper divisors (3458630976).

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

1449721920 is a wasteful number, since it uses less digits than its factorization.

1449721920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669 (or 659 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 1449721920 is about 38075.2139849535. The cubic root of 1449721920 is about 1131.7788361231.

The spelling of 1449721920 in words is "one billion, four hundred forty-nine million, seven hundred twenty-one thousand, nine hundred twenty".