1447981645 has 32 divisors (see below), whose sum is σ = 1936877184. Its totient is φ = 1030348800.

The previous prime is 1447981637. The next prime is 1447981679. The reversal of 1447981645 is 5461897441.

It is not a de Polignac number, because 1447981645 - 2³ = 1447981637 is a prime.

It is a super-3 number, since 3×1447981645³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 524589 + ... + 527341.

It is an arithmetic number, because the mean of its divisors is an integer number (60527412).

Almost surely, 2^1447981645 is an apocalyptic number.

It is an amenable number.

1447981645 is a deficient number, since it is larger than the sum of its proper divisors (488895539).

1447981645 is a wasteful number, since it uses less digits than its factorization.

1447981645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2973.

The product of its digits is 967680, while the sum is 49.

The square root of 1447981645 is about 38052.3540007711. The cubic root of 1447981645 is about 1131.3257848560.

The spelling of 1447981645 in words is "one billion, four hundred forty-seven million, nine hundred eighty-one thousand, six hundred forty-five".