1640332371 has 16 divisors (see below), whose sum is σ = 2231151104. Its totient is φ = 1071753984.

The previous prime is 1640332361. The next prime is 1640332417. The reversal of 1640332371 is 1732330461.

It is not a de Polignac number, because 1640332371 - 2⁹ = 1640331859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640332321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2610 + ... + 57336.

It is an arithmetic number, because the mean of its divisors is an integer number (139446944).

Almost surely, 2^1640332371 is an apocalyptic number.

1640332371 is a deficient number, since it is larger than the sum of its proper divisors (590818733).

1640332371 is a wasteful number, since it uses less digits than its factorization.

1640332371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54930.

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 1640332371 is about 40501.0169131591. The cubic root of 1640332371 is about 1179.3533685441.

The spelling of 1640332371 in words is "one billion, six hundred forty million, three hundred thirty-two thousand, three hundred seventy-one".