1138529172 has 72 divisors (see below), whose sum is σ = 3073789600. Its totient is φ = 326842560.

The previous prime is 1138529167. The next prime is 1138529201. The reversal of 1138529172 is 2719258311.

It is a happy number.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1138529172.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6954 + ... + 48222.

Almost surely, 2^1138529172 is an apocalyptic number.

1138529172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1138529172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1536894800).

1138529172 is an abundant number, since it is smaller than the sum of its proper divisors (1935260428).

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

1138529172 is a wasteful number, since it uses less digits than its factorization.

1138529172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41317 (or 41304 counting only the distinct ones).

The product of its digits is 30240, while the sum is 39.

The square root of 1138529172 is about 33742.0979193648. The cubic root of 1138529172 is about 1044.1944669377.

The spelling of 1138529172 in words is "one billion, one hundred thirty-eight million, five hundred twenty-nine thousand, one hundred seventy-two".