3696739821 has 6 divisors (see below), whose sum is σ = 5339735310. Its totient is φ = 2464493208.

The previous prime is 3696739793. The next prime is 3696739841. The reversal of 3696739821 is 1289376963.

It can be written as a sum of positive squares in only one way, i.e., 2431870596 + 1264869225 = 49314^2 + 35565^2 .

It is not a de Polignac number, because 3696739821 - 2⁶ = 3696739757 is a prime.

It is a super-2 number, since 2×3696739821² = 27331770608334224082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3696739841) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 205374426 + ... + 205374443.

It is an arithmetic number, because the mean of its divisors is an integer number (889955885).

Almost surely, 2^3696739821 is an apocalyptic number.

It is an amenable number.

3696739821 is a deficient number, since it is larger than the sum of its proper divisors (1642995489).

3696739821 is a wasteful number, since it uses less digits than its factorization.

3696739821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410748875 (or 410748872 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 3696739821 is about 60800.8208908400. The cubic root of 3696739821 is about 1546.2259650677.

The spelling of 3696739821 in words is "three billion, six hundred ninety-six million, seven hundred thirty-nine thousand, eight hundred twenty-one".