1252661906 has 8 divisors (see below), whose sum is σ = 1977887280. Its totient is φ = 593366148.

The previous prime is 1252661897. The next prime is 1252661929. The reversal of 1252661906 is 6091662521.

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

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 32964787 = 1252661906 / (1 + 2 + 5 + 2 + 6 + 6 + 1 + 9 + 0 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 1252661906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16482356 + ... + 16482431.

It is an arithmetic number, because the mean of its divisors is an integer number (247235910).

Almost surely, 2^1252661906 is an apocalyptic number.

1252661906 is a deficient number, since it is larger than the sum of its proper divisors (725225374).

1252661906 is a wasteful number, since it uses less digits than its factorization.

1252661906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32964808.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 1252661906 is about 35392.9640747988. The cubic root of 1252661906 is about 1077.9814565579.

The spelling of 1252661906 in words is "one billion, two hundred fifty-two million, six hundred sixty-one thousand, nine hundred six".