1249490788 has 72 divisors (see below), whose sum is σ = 2765472192. Its totient is φ = 489577536.

The previous prime is 1249490783. The next prime is 1249490791. The reversal of 1249490788 is 8870949421.

It is a happy number.

It is a super-2 number, since 2×1249490788² = 3122454458593721888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (1249490783) 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 23 ways as a sum of consecutive naturals, for example, 270345 + ... + 274927.

It is an arithmetic number, because the mean of its divisors is an integer number (38409336).

Almost surely, 2^1249490788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1249490788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1382736096).

1249490788 is an abundant number, since it is smaller than the sum of its proper divisors (1515981404).

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

1249490788 is a wasteful number, since it uses less digits than its factorization.

1249490788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4721 (or 4712 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 52.

The square root of 1249490788 is about 35348.1369806104. The cubic root of 1249490788 is about 1077.0710499491.

The spelling of 1249490788 in words is "one billion, two hundred forty-nine million, four hundred ninety thousand, seven hundred eighty-eight".