1209778412 has 24 divisors (see below), whose sum is σ = 2359632240. Its totient is φ = 539343360.

The previous prime is 1209778391. The next prime is 1209778459. The reversal of 1209778412 is 2148779021.

It is a super-2 number, since 2×1209778412² = 2927127612282483488, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1209778412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466889 + ... + 469472.

It is an arithmetic number, because the mean of its divisors is an integer number (98318010).

Almost surely, 2^1209778412 is an apocalyptic number.

It is an amenable number.

1209778412 is a deficient number, since it is larger than the sum of its proper divisors (1149853828).

1209778412 is a wasteful number, since it uses less digits than its factorization.

1209778412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936401 (or 936399 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 1209778412 is about 34781.8690124611. The cubic root of 1209778412 is about 1065.5371846774.

It can be divided in two parts, 12097 and 78412, that added together give a palindrome (90509).

The spelling of 1209778412 in words is "one billion, two hundred nine million, seven hundred seventy-eight thousand, four hundred twelve".