1640541874 has 4 divisors (see below), whose sum is σ = 2460812814. Its totient is φ = 820270936.

The previous prime is 1640541823. The next prime is 1640541883. The reversal of 1640541874 is 4781450461.

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

It can be written as a sum of positive squares in only one way, i.e., 1292905849 + 347636025 = 35957^2 + 18645^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410135467 + ... + 410135470.

Almost surely, 2^1640541874 is an apocalyptic number.

1640541874 is a deficient number, since it is larger than the sum of its proper divisors (820270940).

1640541874 is an equidigital number, since it uses as much as digits as its factorization.

1640541874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820270939.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 1640541874 is about 40503.6032224295. The cubic root of 1640541874 is about 1179.4035753507.

The spelling of 1640541874 in words is "one billion, six hundred forty million, five hundred forty-one thousand, eight hundred seventy-four".