3686405731 has 4 divisors (see below), whose sum is σ = 3813523200. Its totient is φ = 3559288264.

The previous prime is 3686405729. The next prime is 3686405747. The reversal of 3686405731 is 1375046863.

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

It is a cyclic number.

It is not a de Polignac number, because 3686405731 - 2¹ = 3686405729 is a prime.

It is a super-2 number, since 2×3686405731² = 27179174427099288722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3686405231) 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, 63558691 + ... + 63558748.

It is an arithmetic number, because the mean of its divisors is an integer number (953380800).

Almost surely, 2^3686405731 is an apocalyptic number.

3686405731 is a deficient number, since it is larger than the sum of its proper divisors (127117469).

3686405731 is a wasteful number, since it uses less digits than its factorization.

3686405731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127117468.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 3686405731 is about 60715.7782705616. The cubic root of 3686405731 is about 1544.7838158923.

The spelling of 3686405731 in words is "three billion, six hundred eighty-six million, four hundred five thousand, seven hundred thirty-one".