1380640123 has 8 divisors (see below), whose sum is σ = 1406435840. Its totient is φ = 1354997160.

The previous prime is 1380640099. The next prime is 1380640127. The reversal of 1380640123 is 3210460831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1380640123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1380640091 and 1380640100.

It is not an unprimeable number, because it can be changed into a prime (1380640127) 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 7 ways as a sum of consecutive naturals, for example, 19863 + ... + 56176.

It is an arithmetic number, because the mean of its divisors is an integer number (175804480).

Almost surely, 2^1380640123 is an apocalyptic number.

1380640123 is a deficient number, since it is larger than the sum of its proper divisors (25795717).

1380640123 is an equidigital number, since it uses as much as digits as its factorization.

1380640123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76377.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1380640123 is about 37156.9660090810. The cubic root of 1380640123 is about 1113.5083979452.

The spelling of 1380640123 in words is "one billion, three hundred eighty million, six hundred forty thousand, one hundred twenty-three".