1389087 has 24 divisors (see below), whose sum is σ = 2429856. Its totient is φ = 746496.

The previous prime is 1389083. The next prime is 1389097. The reversal of 1389087 is 7809831.

1389087 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 1389087 - 2² = 1389083 is a prime.

1389087 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389083) 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 23 ways as a sum of consecutive naturals, for example, 423 + ... + 1719.

It is an arithmetic number, because the mean of its divisors is an integer number (101244).

2^1389087 is an apocalyptic number.

1389087 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1389087 is a deficient number, since it is larger than the sum of its proper divisors (1040769).

1389087 is a wasteful number, since it uses less digits than its factorization.

1389087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327 (or 1324 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1389087 is about 1178.5953504066. The cubic root of 1389087 is about 111.5774629790.

The spelling of 1389087 in words is "one million, three hundred eighty-nine thousand, eighty-seven".