1210779440 has 80 divisors (see below), whose sum is σ = 3209982048. Its totient is φ = 420753408.

The previous prime is 1210779439. The next prime is 1210779443. The reversal of 1210779440 is 449770121.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 1210779440.

It is not an unprimeable number, because it can be changed into a prime (1210779443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16562 + ... + 51921.

Almost surely, 2^1210779440 is an apocalyptic number.

1210779440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210779440 is an abundant number, since it is smaller than the sum of its proper divisors (1999202608).

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

1210779440 is a wasteful number, since it uses less digits than its factorization.

1210779440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68526 (or 68520 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 1210779440 is about 34796.2561204507. The cubic root of 1210779440 is about 1065.8309956452.

The spelling of 1210779440 in words is "one billion, two hundred ten million, seven hundred seventy-nine thousand, four hundred forty".