387581481 has 24 divisors (see below), whose sum is σ = 646039680. Its totient is φ = 219321216.

The previous prime is 387581479. The next prime is 387581503. The reversal of 387581481 is 184185783.

It is a happy number.

It is not a de Polignac number, because 387581481 - 2¹ = 387581479 is a prime.

It is a super-2 number, since 2×387581481² = 300438808828306722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (387581981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23376 + ... + 36353.

It is an arithmetic number, because the mean of its divisors is an integer number (26918320).

Almost surely, 2^387581481 is an apocalyptic number.

It is an amenable number.

387581481 is a deficient number, since it is larger than the sum of its proper divisors (258458199).

387581481 is a wasteful number, since it uses less digits than its factorization.

387581481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59845 (or 59842 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 387581481 is about 19687.0891957140. The cubic root of 387581481 is about 729.1009642997.

The spelling of 387581481 in words is "three hundred eighty-seven million, five hundred eighty-one thousand, four hundred eighty-one".