1212409240 has 64 divisors (see below), whose sum is σ = 3123567360. Its totient is φ = 414890880.

The previous prime is 1212409217. The next prime is 1212409241. The reversal of 1212409240 is 429042121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212409241) 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 15 ways as a sum of consecutive naturals, for example, 153795 + ... + 161485.

It is an arithmetic number, because the mean of its divisors is an integer number (48805740).

Almost surely, 2^1212409240 is an apocalyptic number.

1212409240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212409240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1561783680).

1212409240 is an abundant number, since it is smaller than the sum of its proper divisors (1911158120).

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

1212409240 is a wasteful number, since it uses less digits than its factorization.

1212409240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8272 (or 8268 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1212409240 is about 34819.6674309219. The cubic root of 1212409240 is about 1066.3090107329.

The spelling of 1212409240 in words is "one billion, two hundred twelve million, four hundred nine thousand, two hundred forty".