387440305 has 24 divisors (see below), whose sum is σ = 569306880. Its totient is φ = 251687520.

The previous prime is 387440303. The next prime is 387440311. The reversal of 387440305 is 503044783.

It is a happy number.

It is not a de Polignac number, because 387440305 - 2¹ = 387440303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (387440303) 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, 36961 + ... + 46270.

It is an arithmetic number, because the mean of its divisors is an integer number (23721120).

Almost surely, 2^387440305 is an apocalyptic number.

387440305 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

387440305 is a deficient number, since it is larger than the sum of its proper divisors (181866575).

387440305 is a wasteful number, since it uses less digits than its factorization.

387440305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83269 (or 83262 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 387440305 is about 19683.5033721134. The cubic root of 387440305 is about 729.0124288881.

The spelling of 387440305 in words is "three hundred eighty-seven million, four hundred forty thousand, three hundred five".