1212678144 has 120 divisors (see below), whose sum is σ = 3516920550. Its totient is φ = 402653184.

The previous prime is 1212678101. The next prime is 1212678157. The reversal of 1212678144 is 4418762121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 681836544 + 530841600 = 26112^2 + 23040^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1212678099 and 1212678108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4718464 + ... + 4718720.

Almost surely, 2^1212678144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212678144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1758460275).

1212678144 is an abundant number, since it is smaller than the sum of its proper divisors (2304242406).

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

1212678144 is an frugal number, since it uses more digits than its factorization.

1212678144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 262 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 1212678144 is about 34823.5285977742. The cubic root of 1212678144 is about 1066.3878382312.

The spelling of 1212678144 in words is "one billion, two hundred twelve million, six hundred seventy-eight thousand, one hundred forty-four".