387791540 has 24 divisors (see below), whose sum is σ = 821977632. Its totient is φ = 153666080.

The previous prime is 387791533. The next prime is 387791543. The reversal of 387791540 is 45197783.

It is a junction number, because it is equal to n+sod(n) for n = 387791491 and 387791500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387791543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88466 + ... + 92745.

It is an arithmetic number, because the mean of its divisors is an integer number (34249068).

Almost surely, 2^387791540 is an apocalyptic number.

It is an amenable number.

387791540 is an abundant number, since it is smaller than the sum of its proper divisors (434186092).

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

387791540 is a wasteful number, since it uses less digits than its factorization.

387791540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181327 (or 181325 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 387791540 is about 19692.4234161263. The cubic root of 387791540 is about 729.2326583793.

The spelling of 387791540 in words is "three hundred eighty-seven million, seven hundred ninety-one thousand, five hundred forty".