3921661293 has 24 divisors (see below), whose sum is σ = 5894225568. Its totient is φ = 2300076000.

The previous prime is 3921661283. The next prime is 3921661309.

It is a happy number.

3921661293 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 3921661293 - 2¹² = 3921657197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921661223) 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, 30118 + ... + 93543.

It is an arithmetic number, because the mean of its divisors is an integer number (245592732).

Almost surely, 2^3921661293 is an apocalyptic number.

3921661293 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

3921661293 is a deficient number, since it is larger than the sum of its proper divisors (1972564275).

3921661293 is a wasteful number, since it uses less digits than its factorization.

3921661293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123737 (or 123706 counting only the distinct ones).

The product of its digits is 104976, while the sum is 42.

The square root of 3921661293 is about 62623.1689792205. The cubic root of 3921661293 is about 1576.9697425578.

The spelling of 3921661293 in words is "three billion, nine hundred twenty-one million, six hundred sixty-one thousand, two hundred ninety-three".