3405731621 has 8 divisors (see below), whose sum is σ = 3468930624. Its totient is φ = 3342955840.

The previous prime is 3405731573. The next prime is 3405731653. The reversal of 3405731621 is 1261375043.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3405731621 - 2²⁶ = 3338622757 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 (3405731671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89540 + ... + 121773.

It is an arithmetic number, because the mean of its divisors is an integer number (433616328).

Almost surely, 2^3405731621 is an apocalyptic number.

It is an amenable number.

3405731621 is a deficient number, since it is larger than the sum of its proper divisors (63199003).

3405731621 is a wasteful number, since it uses less digits than its factorization.

3405731621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211611.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 3405731621 is about 58358.6464973272. The cubic root of 3405731621 is about 1504.5390833674.

The spelling of 3405731621 in words is "three billion, four hundred five million, seven hundred thirty-one thousand, six hundred twenty-one".