1390123136 has 64 divisors (see below), whose sum is σ = 2842128000. Its totient is φ = 676955136.

The previous prime is 1390123127. The next prime is 1390123139. The reversal of 1390123136 is 6313210931.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 1390123099 and 1390123108.

It is not an unprimeable number, because it can be changed into a prime (1390123139) 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 7 ways as a sum of consecutive naturals, for example, 1617875 + ... + 1618733.

It is an arithmetic number, because the mean of its divisors is an integer number (44408250).

Almost surely, 2^1390123136 is an apocalyptic number.

1390123136 is a gapful number since it is divisible by the number (16) 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 1390123136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1421064000).

1390123136 is an abundant number, since it is smaller than the sum of its proper divisors (1452004864).

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

1390123136 is an equidigital number, since it uses as much as digits as its factorization.

1390123136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189 (or 1177 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 1390123136 is about 37284.3551104213. The cubic root of 1390123136 is about 1116.0519838925.

The spelling of 1390123136 in words is "one billion, three hundred ninety million, one hundred twenty-three thousand, one hundred thirty-six".