1391526389 has 16 divisors (see below), whose sum is σ = 1613770560. Its totient is φ = 1186560000.

The previous prime is 1391526379. The next prime is 1391526391. The reversal of 1391526389 is 9836251931.

It is a cyclic number.

It is not a de Polignac number, because 1391526389 - 2¹⁶ = 1391460853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391526329) 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, 11852 + ... + 54069.

It is an arithmetic number, because the mean of its divisors is an integer number (100860660).

Almost surely, 2^1391526389 is an apocalyptic number.

1391526389 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1391526389 is a deficient number, since it is larger than the sum of its proper divisors (222244171).

1391526389 is a wasteful number, since it uses less digits than its factorization.

1391526389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66052.

The product of its digits is 349920, while the sum is 47.

The square root of 1391526389 is about 37303.1686187648. The cubic root of 1391526389 is about 1116.4273886760.

It can be divided in two parts, 139152 and 6389, that added together give a palindrome (145541).

The spelling of 1391526389 in words is "one billion, three hundred ninety-one million, five hundred twenty-six thousand, three hundred eighty-nine".