1645435874 has 4 divisors (see below), whose sum is σ = 2468153814. Its totient is φ = 822717936.

The previous prime is 1645435873. The next prime is 1645435879. The reversal of 1645435874 is 4785345461.

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., 1310802025 + 334633849 = 36205^2 + 18293^2 .

It is a super-2 number, since 2×1645435874² = 5414918430892287752, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1645435873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411358967 + ... + 411358970.

Almost surely, 2^1645435874 is an apocalyptic number.

1645435874 is a deficient number, since it is larger than the sum of its proper divisors (822717940).

1645435874 is an equidigital number, since it uses as much as digits as its factorization.

1645435874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822717939.

The product of its digits is 1612800, while the sum is 47.

The square root of 1645435874 is about 40563.9726111731. The cubic root of 1645435874 is about 1180.5751945334.

The spelling of 1645435874 in words is "one billion, six hundred forty-five million, four hundred thirty-five thousand, eight hundred seventy-four".