1128139212 has 24 divisors (see below), whose sum is σ = 2770868800. Its totient is φ = 356254416.

The previous prime is 1128139189. The next prime is 1128139217. The reversal of 1128139212 is 2129318211.

It is a self number, because there is not a number n which added to its sum of digits gives 1128139212.

It is not an unprimeable number, because it can be changed into a prime (1128139217) 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, 2473762 + ... + 2474217.

Almost surely, 2^1128139212 is an apocalyptic number.

1128139212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1128139212 is an abundant number, since it is smaller than the sum of its proper divisors (1642729588).

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

1128139212 is a wasteful number, since it uses less digits than its factorization.

1128139212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4948005 (or 4948003 counting only the distinct ones).

The product of its digits is 1728, while the sum is 30.

The square root of 1128139212 is about 33587.7836720436. The cubic root of 1128139212 is about 1041.0083944691.

The spelling of 1128139212 in words is "one billion, one hundred twenty-eight million, one hundred thirty-nine thousand, two hundred twelve".