4020736945 has 4 divisors (see below), whose sum is σ = 4824884340. Its totient is φ = 3216589552.

The previous prime is 4020736931. The next prime is 4020736949. The reversal of 4020736945 is 5496370204.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 516925696 + 3503811249 = 22736^2 + 59193^2 .

It is a cyclic number.

It is not a de Polignac number, because 4020736945 - 2⁷ = 4020736817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4020736898 and 4020736907.

It is not an unprimeable number, because it can be changed into a prime (4020736949) 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, 402073690 + ... + 402073699.

It is an arithmetic number, because the mean of its divisors is an integer number (1206221085).

Almost surely, 2^4020736945 is an apocalyptic number.

It is an amenable number.

4020736945 is a deficient number, since it is larger than the sum of its proper divisors (804147395).

4020736945 is an equidigital number, since it uses as much as digits as its factorization.

4020736945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804147394.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 4020736945 is about 63409.2812212849. The cubic root of 4020736945 is about 1590.1394792136.

The spelling of 4020736945 in words is "four billion, twenty million, seven hundred thirty-six thousand, nine hundred forty-five".