1212312720 has 40 divisors (see below), whose sum is σ = 3758170176. Its totient is φ = 323283328.

The previous prime is 1212312683. The next prime is 1212312737. The reversal of 1212312720 is 272132121.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2525412 + ... + 2525891.

Almost surely, 2^1212312720 is an apocalyptic number.

1212312720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212312720 is an abundant number, since it is smaller than the sum of its proper divisors (2545857456).

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

1212312720 is a wasteful number, since it uses less digits than its factorization.

1212312720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5051319 (or 5051313 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 1212312720 is about 34818.2814050320. The cubic root of 1212312720 is about 1066.2807136657.

Adding to 1212312720 its reverse (272132121), we get a palindrome (1484444841).

The spelling of 1212312720 in words is "one billion, two hundred twelve million, three hundred twelve thousand, seven hundred twenty".