387055813 has 4 divisors (see below), whose sum is σ = 409823820. Its totient is φ = 364287808.

The previous prime is 387055811. The next prime is 387055819. The reversal of 387055813 is 318550783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 318550783 = 2851 ⋅111733.

It can be written as a sum of positive squares in 2 ways, for example, as 173369889 + 213685924 = 13167^2 + 14618^2 .

It is a cyclic number.

It is not a de Polignac number, because 387055813 - 2¹ = 387055811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387055811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11383978 + ... + 11384011.

It is an arithmetic number, because the mean of its divisors is an integer number (102455955).

Almost surely, 2^387055813 is an apocalyptic number.

It is an amenable number.

387055813 is a deficient number, since it is larger than the sum of its proper divisors (22768007).

387055813 is a wasteful number, since it uses less digits than its factorization.

387055813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22768006.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 387055813 is about 19673.7340888810. The cubic root of 387055813 is about 728.7711941168.

The spelling of 387055813 in words is "three hundred eighty-seven million, fifty-five thousand, eight hundred thirteen".