1212749280 has 96 divisors (see below), whose sum is σ = 4244637600. Its totient is φ = 323398656.

The previous prime is 1212749273. The next prime is 1212749299. The reversal of 1212749280 is 829472121.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×1212749280² = 2941521632281036800, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

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, 136045 + ... + 144684.

It is an arithmetic number, because the mean of its divisors is an integer number (44214975).

Almost surely, 2^1212749280 is an apocalyptic number.

1212749280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212749280 is an abundant number, since it is smaller than the sum of its proper divisors (3031888320).

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

1212749280 is a wasteful number, since it uses less digits than its factorization.

1212749280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280753 (or 280739 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1212749280 is about 34824.5499611983. The cubic root of 1212749280 is about 1066.4086893484.

The spelling of 1212749280 in words is "one billion, two hundred twelve million, seven hundred forty-nine thousand, two hundred eighty".