1249999506 has 48 divisors (see below), whose sum is σ = 3231298080. Its totient is φ = 357141960.

The previous prime is 1249999483. The next prime is 1249999507. The reversal of 1249999506 is 6059999421.

1249999506 is a `hidden beast` number, since 1 + 2 + 49 + 9 + 99 + 506 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1249999507) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 233560 + ... + 238851.

It is an arithmetic number, because the mean of its divisors is an integer number (67318710).

Almost surely, 2^1249999506 is an apocalyptic number.

1249999506 is an abundant number, since it is smaller than the sum of its proper divisors (1981298574).

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

1249999506 is a wasteful number, since it uses less digits than its factorization.

1249999506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472436 (or 472423 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 54.

The square root of 1249999506 is about 35355.3320731117. The cubic root of 1249999506 is about 1077.2172031105.

The spelling of 1249999506 in words is "one billion, two hundred forty-nine million, nine hundred ninety-nine thousand, five hundred six".