1447729920 has 432 divisors, whose sum is σ = 6169380672. Its totient is φ = 305233920.

The previous prime is 1447729901. The next prime is 1447729939. The reversal of 1447729920 is 299277441.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1447729901) and next prime (1447729939).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1047630 + ... + 1049010.

Almost surely, 2^1447729920 is an apocalyptic number.

1447729920 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 1447729920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3084690336).

1447729920 is an abundant number, since it is smaller than the sum of its proper divisors (4721650752).

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

1447729920 is a wasteful number, since it uses less digits than its factorization.

1447729920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428 (or 1411 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 1447729920 is about 38049.0462429743. The cubic root of 1447729920 is about 1131.2602224487.

The spelling of 1447729920 in words is "one billion, four hundred forty-seven million, seven hundred twenty-nine thousand, nine hundred twenty".