387978899 has 16 divisors (see below), whose sum is σ = 485848320. Its totient is φ = 300987360.

The previous prime is 387978893. The next prime is 387978923. The reversal of 387978899 is 998879783.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387978899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387978893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6632 + ... + 28634.

It is an arithmetic number, because the mean of its divisors is an integer number (30365520).

Almost surely, 2^387978899 is an apocalyptic number.

387978899 is a deficient number, since it is larger than the sum of its proper divisors (97869421).

387978899 is a wasteful number, since it uses less digits than its factorization.

387978899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22250.

The product of its digits is 54867456, while the sum is 68.

The square root of 387978899 is about 19697.1799758240. The cubic root of 387978899 is about 729.3500808342.

The spelling of 387978899 in words is "three hundred eighty-seven million, nine hundred seventy-eight thousand, eight hundred ninety-nine".