1249023678 has 64 divisors (see below), whose sum is σ = 3001950720. Its totient is φ = 338889600.

The previous prime is 1249023619. The next prime is 1249023679. The reversal of 1249023678 is 8763209421.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249023679) 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 31 ways as a sum of consecutive naturals, for example, 65893 + ... + 82703.

It is an arithmetic number, because the mean of its divisors is an integer number (46905480).

Almost surely, 2^1249023678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1249023678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1500975360).

1249023678 is an abundant number, since it is smaller than the sum of its proper divisors (1752927042).

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

1249023678 is a wasteful number, since it uses less digits than its factorization.

1249023678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16913.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 1249023678 is about 35341.5290840677. The cubic root of 1249023678 is about 1076.9368157020.

The spelling of 1249023678 in words is "one billion, two hundred forty-nine million, twenty-three thousand, six hundred seventy-eight".