1231729272 has 48 divisors (see below), whose sum is σ = 3343977000. Its totient is φ = 409586496.

The previous prime is 1231729259. The next prime is 1231729307. The reversal of 1231729272 is 2729271321.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9754 + ... + 50582.

Almost surely, 2^1231729272 is an apocalyptic number.

1231729272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1231729272 is an abundant number, since it is smaller than the sum of its proper divisors (2112247728).

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

1231729272 is a wasteful number, since it uses less digits than its factorization.

1231729272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41260 (or 41253 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 1231729272 is about 35096.0007978117. Note that the first 3 decimals coincide. The cubic root of 1231729272 is about 1071.9431520125.

The spelling of 1231729272 in words is "one billion, two hundred thirty-one million, seven hundred twenty-nine thousand, two hundred seventy-two".