1252728231 has 8 divisors (see below), whose sum is σ = 1670722560. Its totient is φ = 834943032.

The previous prime is 1252728223. The next prime is 1252728233. The reversal of 1252728231 is 1328272521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1252728231 - 2³ = 1252728223 is a prime.

It is a super-2 number, since 2×1252728231² = 3138656041488778722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1252728192 and 1252728201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252728233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37725 + ... + 62678.

It is an arithmetic number, because the mean of its divisors is an integer number (208840320).

Almost surely, 2^1252728231 is an apocalyptic number.

1252728231 is a deficient number, since it is larger than the sum of its proper divisors (417994329).

1252728231 is a wasteful number, since it uses less digits than its factorization.

1252728231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104565.

The product of its digits is 13440, while the sum is 33.

The square root of 1252728231 is about 35393.9010424112. The cubic root of 1252728231 is about 1078.0004816058. Note that the first 3 decimals are identical.

The spelling of 1252728231 in words is "one billion, two hundred fifty-two million, seven hundred twenty-eight thousand, two hundred thirty-one".