3745072809 has 9 divisors (see below), whose sum is σ = 5409814813. Its totient is φ = 2496592812.

The previous prime is 3745072777. The next prime is 3745072811. The reversal of 3745072809 is 9082705473.

The square root of 3745072809 is 61197.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 3745072809 - 2⁵ = 3745072777 is a prime.

It is a super-2 number, since 2×3745072809² = 28051140689422300962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3745072109) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 173392 + ... + 193790.

Almost surely, 2^3745072809 is an apocalyptic number.

3745072809 is the 61197-th square number.

3745072809 is the 30599-th centered octagonal number.

It is an amenable number.

3745072809 is a deficient number, since it is larger than the sum of its proper divisors (1664742004).

3745072809 is an frugal number, since it uses more digits than its factorization.

3745072809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40804 (or 20402 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The cubic root of 3745072809 is about 1552.9355134985.

The spelling of 3745072809 in words is "three billion, seven hundred forty-five million, seventy-two thousand, eight hundred nine".