387705390 has 32 divisors (see below), whose sum is σ = 939534336. Its totient is φ = 102383520.

The previous prime is 387705371. The next prime is 387705391. The reversal of 387705390 is 93507783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387705391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59646 + ... + 65825.

It is an arithmetic number, because the mean of its divisors is an integer number (29360448).

Almost surely, 2^387705390 is an apocalyptic number.

387705390 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

387705390 is an abundant number, since it is smaller than the sum of its proper divisors (551828946).

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

387705390 is a wasteful number, since it uses less digits than its factorization.

387705390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125584.

The product of its (nonzero) digits is 158760, while the sum is 42.

The square root of 387705390 is about 19690.2359051384. The cubic root of 387705390 is about 729.1786533794.

The spelling of 387705390 in words is "three hundred eighty-seven million, seven hundred five thousand, three hundred ninety".