3699242721 has 24 divisors (see below), whose sum is σ = 5810584104. Its totient is φ = 2258357760.

The previous prime is 3699242713. The next prime is 3699242779. The reversal of 3699242721 is 1272429963.

It can be written as a sum of positive squares in 4 ways, for example, as 663783696 + 3035459025 = 25764^2 + 55095^2 .

It is not a de Polignac number, because 3699242721 - 2³ = 3699242713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3699242021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 321070 + ... + 332391.

It is an arithmetic number, because the mean of its divisors is an integer number (242107671).

Almost surely, 2^3699242721 is an apocalyptic number.

It is an amenable number.

3699242721 is a deficient number, since it is larger than the sum of its proper divisors (2111341383).

3699242721 is a wasteful number, since it uses less digits than its factorization.

3699242721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653521 (or 653518 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 3699242721 is about 60821.4001894070. The cubic root of 3699242721 is about 1546.5748468816.

It can be divided in two parts, 3699242 and 721, that added together give a palindrome (3699963).

The spelling of 3699242721 in words is "three billion, six hundred ninety-nine million, two hundred forty-two thousand, seven hundred twenty-one".