387556261 has 4 divisors (see below), whose sum is σ = 400920300. Its totient is φ = 374192224.

The previous prime is 387556249. The next prime is 387556289. The reversal of 387556261 is 162655783.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 323460225 + 64096036 = 17985^2 + 8006^2 .

It is a cyclic number.

It is not a de Polignac number, because 387556261 - 2¹¹ = 387554213 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 (387556861) 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, 6681976 + ... + 6682033.

It is an arithmetic number, because the mean of its divisors is an integer number (100230075).

Almost surely, 2^387556261 is an apocalyptic number.

It is an amenable number.

387556261 is a deficient number, since it is larger than the sum of its proper divisors (13364039).

387556261 is a wasteful number, since it uses less digits than its factorization.

387556261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13364038.

The product of its digits is 302400, while the sum is 43.

The square root of 387556261 is about 19686.4486639922. The cubic root of 387556261 is about 729.0851497109.

The spelling of 387556261 in words is "three hundred eighty-seven million, five hundred fifty-six thousand, two hundred sixty-one".