387999540 has 72 divisors (see below), whose sum is σ = 1179091368. Its totient is φ = 103276800.

The previous prime is 387999539. The next prime is 387999553. The reversal of 387999540 is 45999783.

387999540 is a `hidden beast` number, since 3 + 8 + 7 + 9 + 99 + 540 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 224676 + 387774864 = 474^2 + 19692^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115890 + ... + 119190.

It is an arithmetic number, because the mean of its divisors is an integer number (16376269).

Almost surely, 2^387999540 is an apocalyptic number.

387999540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

387999540 is an abundant number, since it is smaller than the sum of its proper divisors (791091828).

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

387999540 is a wasteful number, since it uses less digits than its factorization.

387999540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3969 (or 3964 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The square root of 387999540 is about 19697.7039271078. The cubic root of 387999540 is about 729.3630147404.

The spelling of 387999540 in words is "three hundred eighty-seven million, nine hundred ninety-nine thousand, five hundred forty".