1252640189 has 8 divisors (see below), whose sum is σ = 1396131840. Its totient is φ = 1116904896.

The previous prime is 1252640161. The next prime is 1252640261. The reversal of 1252640189 is 9810462521.

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

It is not a de Polignac number, because 1252640189 - 2²⁸ = 984204733 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 (1252610189) 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, 1938749 + ... + 1939394.

It is an arithmetic number, because the mean of its divisors is an integer number (174516480).

Almost surely, 2^1252640189 is an apocalyptic number.

1252640189 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1252640189 is a deficient number, since it is larger than the sum of its proper divisors (143491651).

1252640189 is a wasteful number, since it uses less digits than its factorization.

1252640189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3878179.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 1252640189 is about 35392.6572752033. The cubic root of 1252640189 is about 1077.9752269817.

The spelling of 1252640189 in words is "one billion, two hundred fifty-two million, six hundred forty thousand, one hundred eighty-nine".