1138121972 has 48 divisors (see below), whose sum is σ = 2310454272. Its totient is φ = 486224640.

The previous prime is 1138121969. The next prime is 1138121981. The reversal of 1138121972 is 2791218311.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 21728 + ... + 52424.

It is an arithmetic number, because the mean of its divisors is an integer number (48134464).

Almost surely, 2^1138121972 is an apocalyptic number.

It is an amenable number.

1138121972 is an abundant number, since it is smaller than the sum of its proper divisors (1172332300).

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

1138121972 is a wasteful number, since it uses less digits than its factorization.

1138121972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30768 (or 30766 counting only the distinct ones).

The product of its digits is 6048, while the sum is 35.

The square root of 1138121972 is about 33736.0633743773. The cubic root of 1138121972 is about 1044.0699651686.

The spelling of 1138121972 in words is "one billion, one hundred thirty-eight million, one hundred twenty-one thousand, nine hundred seventy-two".