1212242040 has 48 divisors (see below), whose sum is σ = 3939787800. Its totient is φ = 323264448.

The previous prime is 1212242027. The next prime is 1212242041. The reversal of 1212242040 is 402422121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212242041) 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 11 ways as a sum of consecutive naturals, for example, 1683310 + ... + 1684029.

Almost surely, 2^1212242040 is an apocalyptic number.

1212242040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212242040 is an abundant number, since it is smaller than the sum of its proper divisors (2727545760).

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

1212242040 is a wasteful number, since it uses less digits than its factorization.

1212242040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3367356 (or 3367349 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1212242040 is about 34817.2664061956. The cubic root of 1212242040 is about 1066.2599912387.

Adding to 1212242040 its reverse (402422121), we get a palindrome (1614664161).

The spelling of 1212242040 in words is "one billion, two hundred twelve million, two hundred forty-two thousand, forty".