1640123115 has 32 divisors (see below), whose sum is σ = 2652549120. Its totient is φ = 865334016.

The previous prime is 1640123113. The next prime is 1640123119. The reversal of 1640123115 is 5113210461.

It is a happy number.

It is not a de Polignac number, because 1640123115 - 2¹ = 1640123113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640123113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 568246 + ... + 571124.

It is an arithmetic number, because the mean of its divisors is an integer number (82892160).

Almost surely, 2^1640123115 is an apocalyptic number.

1640123115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1640123115 is a deficient number, since it is larger than the sum of its proper divisors (1012426005).

1640123115 is a wasteful number, since it uses less digits than its factorization.

1640123115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3283.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1640123115 is about 40498.4334882227. The cubic root of 1640123115 is about 1179.3032166627.

Adding to 1640123115 its reverse (5113210461), we get a palindrome (6753333576).

The spelling of 1640123115 in words is "one billion, six hundred forty million, one hundred twenty-three thousand, one hundred fifteen".