387012816 has 50 divisors (see below), whose sum is σ = 1120131122. Its totient is φ = 129003840.

The previous prime is 387012799. The next prime is 387012833. The reversal of 387012816 is 618210783.

It is an interprime number because it is at equal distance from previous prime (387012799) and next prime (387012833).

It can be written as a sum of positive squares in only one way, i.e., 376515216 + 10497600 = 19404^2 + 3240^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 148015 + ... + 150606.

Almost surely, 2^387012816 is an apocalyptic number.

387012816 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

387012816 is an abundant number, since it is smaller than the sum of its proper divisors (733118306).

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

387012816 is a wasteful number, since it uses less digits than its factorization.

387012816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298641 (or 298626 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 387012816 is about 19672.6413071555. The cubic root of 387012816 is about 728.7442073668.

The spelling of 387012816 in words is "three hundred eighty-seven million, twelve thousand, eight hundred sixteen".