1391332389 has 8 divisors (see below), whose sum is σ = 1855877760. Its totient is φ = 927170976.

The previous prime is 1391332379. The next prime is 1391332447. The reversal of 1391332389 is 9832331931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1391332389 - 2⁴ = 1391332373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1391332389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391332379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87424 + ... + 102105.

It is an arithmetic number, because the mean of its divisors is an integer number (231984720).

Almost surely, 2^1391332389 is an apocalyptic number.

It is an amenable number.

1391332389 is a deficient number, since it is larger than the sum of its proper divisors (464545371).

1391332389 is a wasteful number, since it uses less digits than its factorization.

1391332389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191979.

The product of its digits is 104976, while the sum is 42.

The square root of 1391332389 is about 37300.5682128302. The cubic root of 1391332389 is about 1116.3755039301.

It can be divided in two parts, 139 and 1332389, that added together give a triangular number (1332528 = T₁₆₃₂).

The spelling of 1391332389 in words is "one billion, three hundred ninety-one million, three hundred thirty-two thousand, three hundred eighty-nine".