1216426437 has 32 divisors (see below), whose sum is σ = 1855040000. Its totient is φ = 787475520.

The previous prime is 1216426433. The next prime is 1216426439. The reversal of 1216426437 is 7346246121.

1216426437 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 4 + 2 + 643 + 7 = 666.

It is not a de Polignac number, because 1216426437 - 2² = 1216426433 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216426433) 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 31 ways as a sum of consecutive naturals, for example, 125439 + ... + 134787.

It is an arithmetic number, because the mean of its divisors is an integer number (57970000).

Almost surely, 2^1216426437 is an apocalyptic number.

It is an amenable number.

1216426437 is a deficient number, since it is larger than the sum of its proper divisors (638613563).

1216426437 is an equidigital number, since it uses as much as digits as its factorization.

1216426437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9498 (or 9492 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 1216426437 is about 34877.3054721835. The cubic root of 1216426437 is about 1067.4854152128.

The spelling of 1216426437 in words is "one billion, two hundred sixteen million, four hundred twenty-six thousand, four hundred thirty-seven".