1239451878 has 64 divisors (see below), whose sum is σ = 3021815808. Its totient is φ = 330839040.

The previous prime is 1239451877. The next prime is 1239451879. The reversal of 1239451878 is 8781549321.

It is an interprime number because it is at equal distance from previous prime (1239451877) and next prime (1239451879).

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239451877) 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 31 ways as a sum of consecutive naturals, for example, 91483 + ... + 104153.

It is an arithmetic number, because the mean of its divisors is an integer number (47215872).

Almost surely, 2^1239451878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1239451878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1510907904).

1239451878 is an abundant number, since it is smaller than the sum of its proper divisors (1782363930).

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

1239451878 is a wasteful number, since it uses less digits than its factorization.

1239451878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12837.

The product of its digits is 483840, while the sum is 48.

The square root of 1239451878 is about 35205.8500536488. The cubic root of 1239451878 is about 1074.1787498675.

The spelling of 1239451878 in words is "one billion, two hundred thirty-nine million, four hundred fifty-one thousand, eight hundred seventy-eight".