1640043015 has 64 divisors (see below), whose sum is σ = 2871880704. Its totient is φ = 794400768.

The previous prime is 1640042983. The next prime is 1640043047. The reversal of 1640043015 is 5103400461.

It is an interprime number because it is at equal distance from previous prime (1640042983) and next prime (1640043047).

It is not a de Polignac number, because 1640043015 - 2⁵ = 1640042983 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5795064 + ... + 5795346.

It is an arithmetic number, because the mean of its divisors is an integer number (44873136).

Almost surely, 2^1640043015 is an apocalyptic number.

1640043015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1640043015 is a deficient number, since it is larger than the sum of its proper divisors (1231837689).

1640043015 is a wasteful number, since it uses less digits than its factorization.

1640043015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1640043015 is about 40497.4445490083. Note that the first 3 decimals coincide. The cubic root of 1640043015 is about 1179.2840181597.

Adding to 1640043015 its reverse (5103400461), we get a palindrome (6743443476).

The spelling of 1640043015 in words is "one billion, six hundred forty million, forty-three thousand, fifteen".