1239931420 has 96 divisors (see below), whose sum is σ = 3291539328. Its totient is φ = 381791232.

The previous prime is 1239931411. The next prime is 1239931463. The reversal of 1239931420 is 241399321.

It is a congruent number.

It is an unprimeable number.

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, 58134 + ... + 76546.

It is an arithmetic number, because the mean of its divisors is an integer number (34286868).

Almost surely, 2^1239931420 is an apocalyptic number.

1239931420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1239931420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1645769664).

1239931420 is an abundant number, since it is smaller than the sum of its proper divisors (2051607908).

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

1239931420 is a wasteful number, since it uses less digits than its factorization.

1239931420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18479 (or 18477 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 1239931420 is about 35212.6599392889. The cubic root of 1239931420 is about 1074.3172647001.

The spelling of 1239931420 in words is "one billion, two hundred thirty-nine million, nine hundred thirty-one thousand, four hundred twenty".