386278561 has 4 divisors (see below), whose sum is σ = 388739092. Its totient is φ = 383818032.

The previous prime is 386278547. The next prime is 386278577. The reversal of 386278561 is 165872683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165872683 = 257 ⋅645419.

It can be written as a sum of positive squares in 2 ways, for example, as 233508961 + 152769600 = 15281^2 + 12360^2 .

It is a cyclic number.

It is not a de Polignac number, because 386278561 - 2⁷ = 386278433 is a prime.

It is a super-2 number, since 2×386278561² = 298422253376461442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (386278511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1230030 + ... + 1230343.

It is an arithmetic number, because the mean of its divisors is an integer number (97184773).

Almost surely, 2^386278561 is an apocalyptic number.

It is an amenable number.

386278561 is a deficient number, since it is larger than the sum of its proper divisors (2460531).

386278561 is a wasteful number, since it uses less digits than its factorization.

386278561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460530.

The product of its digits is 483840, while the sum is 46.

The square root of 386278561 is about 19653.9706166464. The cubic root of 386278561 is about 728.2830487981.

The spelling of 386278561 in words is "three hundred eighty-six million, two hundred seventy-eight thousand, five hundred sixty-one".