1299620140 has 288 divisors, whose sum is σ = 3689280000. Its totient is φ = 383056128.

The previous prime is 1299620117. The next prime is 1299620143. The reversal of 1299620140 is 410269921.

It is a junction number, because it is equal to n+sod(n) for n = 1299620096 and 1299620105.

It is not an unprimeable number, because it can be changed into a prime (1299620143) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 22027431 + ... + 22027489.

It is an arithmetic number, because the mean of its divisors is an integer number (12810000).

Almost surely, 2^1299620140 is an apocalyptic number.

1299620140 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 1299620140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1844640000).

1299620140 is an abundant number, since it is smaller than the sum of its proper divisors (2389659860).

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

1299620140 is a wasteful number, since it uses less digits than its factorization.

1299620140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 1299620140 is about 36050.2446593640. The cubic root of 1299620140 is about 1091.2865710388.

It can be divided in two parts, 129 and 9620140, that added together give a palindrome (9620269).

The spelling of 1299620140 in words is "one billion, two hundred ninety-nine million, six hundred twenty thousand, one hundred forty".