1239969140 has 12 divisors (see below), whose sum is σ = 2603935236. Its totient is φ = 495987648.

The previous prime is 1239969119. The next prime is 1239969149. The reversal of 1239969140 is 419699321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 253255396 + 986713744 = 15914^2 + 31412^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1239969091 and 1239969100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239969149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30999209 + ... + 30999248.

It is an arithmetic number, because the mean of its divisors is an integer number (216994603).

Almost surely, 2^1239969140 is an apocalyptic number.

1239969140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1239969140 is an abundant number, since it is smaller than the sum of its proper divisors (1363966096).

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

1239969140 is a wasteful number, since it uses less digits than its factorization.

1239969140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61998466 (or 61998464 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 1239969140 is about 35213.1955380366. The cubic root of 1239969140 is about 1074.3281585381.

The spelling of 1239969140 in words is "one billion, two hundred thirty-nine million, nine hundred sixty-nine thousand, one hundred forty".