3992723261 has 4 divisors (see below), whose sum is σ = 3992965500. Its totient is φ = 3992481024.

The previous prime is 3992723257. The next prime is 3992723281. The reversal of 3992723261 is 1623272993.

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 3504048025 + 488675236 = 59195^2 + 22106^2 .

It is a cyclic number.

It is not a de Polignac number, because 3992723261 - 2² = 3992723257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3992723201) 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, 94436 + ... + 130013.

It is an arithmetic number, because the mean of its divisors is an integer number (998241375).

Almost surely, 2^3992723261 is an apocalyptic number.

It is an amenable number.

3992723261 is a deficient number, since it is larger than the sum of its proper divisors (242239).

3992723261 is a wasteful number, since it uses less digits than its factorization.

3992723261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242238.

The product of its digits is 244944, while the sum is 44.

The square root of 3992723261 is about 63187.9993432297. Note that the first 3 decimals coincide. The cubic root of 3992723261 is about 1586.4378757381.

The spelling of 3992723261 in words is "three billion, nine hundred ninety-two million, seven hundred twenty-three thousand, two hundred sixty-one".