1640242315 has 4 divisors (see below), whose sum is σ = 1968290784. Its totient is φ = 1312193848.

The previous prime is 1640242313. The next prime is 1640242327. The reversal of 1640242315 is 5132420461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5132420461 = 7 ⋅733202923.

It is a cyclic number.

It is not a de Polignac number, because 1640242315 - 2¹ = 1640242313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640242313) 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 3 ways as a sum of consecutive naturals, for example, 164024227 + ... + 164024236.

It is an arithmetic number, because the mean of its divisors is an integer number (492072696).

Almost surely, 2^1640242315 is an apocalyptic number.

1640242315 is a deficient number, since it is larger than the sum of its proper divisors (328048469).

1640242315 is an equidigital number, since it uses as much as digits as its factorization.

1640242315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328048468.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 1640242315 is about 40499.9051233457. The cubic root of 1640242315 is about 1179.3317855624.

Adding to 1640242315 its reverse (5132420461), we get a palindrome (6772662776).

The spelling of 1640242315 in words is "one billion, six hundred forty million, two hundred forty-two thousand, three hundred fifteen".