1213269828 has 12 divisors (see below), whose sum is σ = 2830962960. Its totient is φ = 404423272.

The previous prime is 1213269823. The next prime is 1213269859. The reversal of 1213269828 is 8289623121.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1213269828.

It is not an unprimeable number, because it can be changed into a prime (1213269823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50552898 + ... + 50552921.

It is an arithmetic number, because the mean of its divisors is an integer number (235913580).

Almost surely, 2^1213269828 is an apocalyptic number.

It is an amenable number.

1213269828 is an abundant number, since it is smaller than the sum of its proper divisors (1617693132).

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

1213269828 is a wasteful number, since it uses less digits than its factorization.

1213269828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101105826 (or 101105824 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 1213269828 is about 34832.0230247972. The cubic root of 1213269828 is about 1066.5612456143.

The spelling of 1213269828 in words is "one billion, two hundred thirteen million, two hundred sixty-nine thousand, eight hundred twenty-eight".