1640377371 has 4 divisors (see below), whose sum is σ = 2187169832. Its totient is φ = 1093584912.

The previous prime is 1640377337. The next prime is 1640377381. The reversal of 1640377371 is 1737730461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1640377371 - 2¹⁴ = 1640360987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640377381) 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, 273396226 + ... + 273396231.

It is an arithmetic number, because the mean of its divisors is an integer number (546792458).

Almost surely, 2^1640377371 is an apocalyptic number.

1640377371 is a deficient number, since it is larger than the sum of its proper divisors (546792461).

1640377371 is an equidigital number, since it uses as much as digits as its factorization.

1640377371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546792460.

The product of its (nonzero) digits is 74088, while the sum is 39.

The square root of 1640377371 is about 40501.5724509555. The cubic root of 1640377371 is about 1179.3641530284.

The spelling of 1640377371 in words is "one billion, six hundred forty million, three hundred seventy-seven thousand, three hundred seventy-one".