1211986028 has 12 divisors (see below), whose sum is σ = 2313791592. Its totient is φ = 550902720.

The previous prime is 1211986007. The next prime is 1211986073. The reversal of 1211986028 is 8206891121.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1211985982 and 1211986000.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13772525 + ... + 13772612.

It is an arithmetic number, because the mean of its divisors is an integer number (192815966).

Almost surely, 2^1211986028 is an apocalyptic number.

It is an amenable number.

1211986028 is a deficient number, since it is larger than the sum of its proper divisors (1101805564).

1211986028 is a wasteful number, since it uses less digits than its factorization.

1211986028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27545152 (or 27545150 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 1211986028 is about 34813.5897028732. The cubic root of 1211986028 is about 1066.1849252143.

The spelling of 1211986028 in words is "one billion, two hundred eleven million, nine hundred eighty-six thousand, twenty-eight".