1212409520 has 40 divisors (see below), whose sum is σ = 3221546784. Its totient is φ = 415683072.

The previous prime is 1212409501. The next prime is 1212409529. The reversal of 1212409520 is 259042121.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1212409520.

It is not an unprimeable number, because it can be changed into a prime (1212409529) by changing a digit.

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, 1081949 + ... + 1083068.

Almost surely, 2^1212409520 is an apocalyptic number.

1212409520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212409520 is an abundant number, since it is smaller than the sum of its proper divisors (2009137264).

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

1212409520 is a wasteful number, since it uses less digits than its factorization.

1212409520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165037 (or 2165031 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1212409520 is about 34819.6714516378. The cubic root of 1212409520 is about 1066.3090928191.

The spelling of 1212409520 in words is "one billion, two hundred twelve million, four hundred nine thousand, five hundred twenty".