1640376527 has 4 divisors (see below), whose sum is σ = 1645023840. Its totient is φ = 1635729216.

The previous prime is 1640376523. The next prime is 1640376539. The reversal of 1640376527 is 7256730461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7256730461 = 149 ⋅48702889.

It is a cyclic number.

It is not a de Polignac number, because 1640376527 - 2² = 1640376523 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640376523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2323127 + ... + 2323832.

It is an arithmetic number, because the mean of its divisors is an integer number (411255960).

Almost surely, 2^1640376527 is an apocalyptic number.

1640376527 is a deficient number, since it is larger than the sum of its proper divisors (4647313).

1640376527 is an equidigital number, since it uses as much as digits as its factorization.

1640376527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4647312.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 1640376527 is about 40501.5620316056. The cubic root of 1640376527 is about 1179.3639507612.

The spelling of 1640376527 in words is "one billion, six hundred forty million, three hundred seventy-six thousand, five hundred twenty-seven".