1386531 has 16 divisors (see below), whose sum is σ = 2080800. Its totient is φ = 912384.

The previous prime is 1386499. The next prime is 1386551. The reversal of 1386531 is 1356831.

1386531 is a `hidden beast` number, since 1 + 3 + 8 + 653 + 1 = 666.

It is not a de Polignac number, because 1386531 - 2⁵ = 1386499 is a prime.

It is a super-2 number, since 2×1386531² = 3844936427922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1386495 and 1386504.

It is not an unprimeable number, because it can be changed into a prime (1386551) 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, 2115 + ... + 2691.

It is an arithmetic number, because the mean of its divisors is an integer number (130050).

2^1386531 is an apocalyptic number.

1386531 is a deficient number, since it is larger than the sum of its proper divisors (694269).

1386531 is an equidigital number, since it uses as much as digits as its factorization.

1386531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675 (or 669 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1386531 is about 1177.5105095072. The cubic root of 1386531 is about 111.5089846434.

The spelling of 1386531 in words is "one million, three hundred eighty-six thousand, five hundred thirty-one".