1385726669 has 4 divisors (see below), whose sum is σ = 1386249696. Its totient is φ = 1385203644.

The previous prime is 1385726659. The next prime is 1385726689. The reversal of 1385726669 is 9666275831.

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 1385726669 - 2⁴ = 1385726653 is a prime.

It is a super-2 number, since 2×1385726669² = 3840476802355671122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1385726669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385726659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257519 + ... + 262844.

It is an arithmetic number, because the mean of its divisors is an integer number (346562424).

Almost surely, 2^1385726669 is an apocalyptic number.

It is an amenable number.

1385726669 is a deficient number, since it is larger than the sum of its proper divisors (523027).

1385726669 is an equidigital number, since it uses as much as digits as its factorization.

1385726669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523026.

The product of its digits is 3265920, while the sum is 53.

The square root of 1385726669 is about 37225.3498170266. The cubic root of 1385726669 is about 1114.8741823484.

The spelling of 1385726669 in words is "one billion, three hundred eighty-five million, seven hundred twenty-six thousand, six hundred sixty-nine".