1236155420 has 12 divisors (see below), whose sum is σ = 2595926424. Its totient is φ = 494462160.

The previous prime is 1236155419. The next prime is 1236155441. The reversal of 1236155420 is 245516321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30903866 + ... + 30903905.

It is an arithmetic number, because the mean of its divisors is an integer number (216327202).

Almost surely, 2^1236155420 is an apocalyptic number.

1236155420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1236155420 is an abundant number, since it is smaller than the sum of its proper divisors (1359771004).

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

1236155420 is a wasteful number, since it uses less digits than its factorization.

1236155420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61807780 (or 61807778 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1236155420 is about 35159.0019767342. The cubic root of 1236155420 is about 1073.2256056980.

The spelling of 1236155420 in words is "one billion, two hundred thirty-six million, one hundred fifty-five thousand, four hundred twenty".