1538434480 has 80 divisors (see below), whose sum is σ = 3917035008. Its totient is φ = 557280000.

The previous prime is 1538434463. The next prime is 1538434481. The reversal of 1538434480 is 844348351.

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

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1538434481) 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, 235255 + ... + 241705.

Almost surely, 2^1538434480 is an apocalyptic number.

1538434480 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 1538434480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1958517504).

1538434480 is an abundant number, since it is smaller than the sum of its proper divisors (2378600528).

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

1538434480 is a wasteful number, since it uses less digits than its factorization.

1538434480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6746 (or 6740 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 40.

The square root of 1538434480 is about 39222.8820970617. The cubic root of 1538434480 is about 1154.4089052704.

The spelling of 1538434480 in words is "one billion, five hundred thirty-eight million, four hundred thirty-four thousand, four hundred eighty".