1212423440 has 40 divisors (see below), whose sum is σ = 2967250560. Its totient is φ = 459444096.

The previous prime is 1212423431. The next prime is 1212423451. The reversal of 1212423440 is 443242121.

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

It is a super-2 number, since 2×1212423440² = 2939941195722867200, which contains 22 as substring.

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, 397304 + ... + 400343.

It is an arithmetic number, because the mean of its divisors is an integer number (74181264).

Almost surely, 2^1212423440 is an apocalyptic number.

1212423440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212423440 is an abundant number, since it is smaller than the sum of its proper divisors (1754827120).

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

1212423440 is a wasteful number, since it uses less digits than its factorization.

1212423440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797679 (or 797673 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1212423440 is about 34819.8713380736. The cubic root of 1212423440 is about 1066.3131736641.

Adding to 1212423440 its reverse (443242121), we get a palindrome (1655665561).

The spelling of 1212423440 in words is "one billion, two hundred twelve million, four hundred twenty-three thousand, four hundred forty".