1387589669 has 4 divisors (see below), whose sum is σ = 1390126944. Its totient is φ = 1385052396.

The previous prime is 1387589659. The next prime is 1387589677. The reversal of 1387589669 is 9669857831.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1387589669 - 2²⁸ = 1119154213 is a prime.

It is a super-2 number, since 2×1387589669² = 3850810179031059122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387589629) 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, 1267817 + ... + 1268910.

It is an arithmetic number, because the mean of its divisors is an integer number (347531736).

Almost surely, 2^1387589669 is an apocalyptic number.

It is an amenable number.

1387589669 is a deficient number, since it is larger than the sum of its proper divisors (2537275).

1387589669 is an equidigital number, since it uses as much as digits as its factorization.

1387589669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2537274.

The product of its digits is 19595520, while the sum is 62.

The square root of 1387589669 is about 37250.3646827786. The cubic root of 1387589669 is about 1115.3735786942.

The spelling of 1387589669 in words is "one billion, three hundred eighty-seven million, five hundred eighty-nine thousand, six hundred sixty-nine".