1640381215 has 8 divisors (see below), whose sum is σ = 2147408208. Its totient is φ = 1193004480.

The previous prime is 1640381203. The next prime is 1640381219. The reversal of 1640381215 is 5121830461.

1640381215 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1640381215 - 2¹⁵ = 1640348447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640381219) 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, 14912502 + ... + 14912611.

It is an arithmetic number, because the mean of its divisors is an integer number (268426026).

Almost surely, 2^1640381215 is an apocalyptic number.

1640381215 is a deficient number, since it is larger than the sum of its proper divisors (507026993).

1640381215 is a wasteful number, since it uses less digits than its factorization.

1640381215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29825129.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 1640381215 is about 40501.6199058754. The cubic root of 1640381215 is about 1179.3650742539.

The spelling of 1640381215 in words is "one billion, six hundred forty million, three hundred eighty-one thousand, two hundred fifteen".