387056689 has 4 divisors (see below), whose sum is σ = 387096640. Its totient is φ = 387016740.

The previous prime is 387056671. The next prime is 387056699. The reversal of 387056689 is 986650783.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 986650783 = 61 ⋅16174603.

It is a cyclic number.

It is not a de Polignac number, because 387056689 - 2¹¹ = 387054641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387056699) 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, 4804 + ... + 28234.

It is an arithmetic number, because the mean of its divisors is an integer number (96774160).

Almost surely, 2^387056689 is an apocalyptic number.

It is an amenable number.

387056689 is a deficient number, since it is larger than the sum of its proper divisors (39951).

387056689 is a wasteful number, since it uses less digits than its factorization.

387056689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39950.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The square root of 387056689 is about 19673.7563520544. The cubic root of 387056689 is about 728.7717439110.

The spelling of 387056689 in words is "three hundred eighty-seven million, fifty-six thousand, six hundred eighty-nine".