1389657276 has 96 divisors (see below), whose sum is σ = 4154196480. Its totient is φ = 393507072.

The previous prime is 1389657271. The next prime is 1389657289. The reversal of 1389657276 is 6727569831.

It is a super-2 number, since 2×1389657276² = 3862294689479480352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389657271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77295 + ... + 93561.

It is an arithmetic number, because the mean of its divisors is an integer number (43272880).

Almost surely, 2^1389657276 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1389657276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2077098240).

1389657276 is an abundant number, since it is smaller than the sum of its proper divisors (2764539204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1389657276 is a wasteful number, since it uses less digits than its factorization.

1389657276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16400 (or 16392 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 54.

The square root of 1389657276 is about 37278.1071944379. The cubic root of 1389657276 is about 1115.9272989986.

The spelling of 1389657276 in words is "one billion, three hundred eighty-nine million, six hundred fifty-seven thousand, two hundred seventy-six".