1672591405 has 4 divisors (see below), whose sum is σ = 2007109692. Its totient is φ = 1338073120.

The previous prime is 1672591387. The next prime is 1672591409. The reversal of 1672591405 is 5041952761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5041952761 = 677 ⋅7447493.

It can be written as a sum of positive squares in 2 ways, for example, as 778521604 + 894069801 = 27902^2 + 29901^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1672591405 is a prime.

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 a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1672591409) 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, 167259136 + ... + 167259145.

It is an arithmetic number, because the mean of its divisors is an integer number (501777423).

Almost surely, 2^1672591405 is an apocalyptic number.

It is an amenable number.

1672591405 is a deficient number, since it is larger than the sum of its proper divisors (334518287).

1672591405 is an equidigital number, since it uses as much as digits as its factorization.

1672591405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334518286.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 1672591405 is about 40897.3276021796. The cubic root of 1672591405 is about 1187.0343508381.

The spelling of 1672591405 in words is "one billion, six hundred seventy-two million, five hundred ninety-one thousand, four hundred five".