3859401621 has 4 divisors (see below), whose sum is σ = 5145868832. Its totient is φ = 2572934412.

The previous prime is 3859401613. The next prime is 3859401629. The reversal of 3859401621 is 1261049583.

3859401621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1261049583 = 3 ⋅420349861.

It is an interprime number because it is at equal distance from previous prime (3859401613) and next prime (3859401629).

It is not a de Polignac number, because 3859401621 - 2³ = 3859401613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3859401621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3859401629) 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, 643233601 + ... + 643233606.

It is an arithmetic number, because the mean of its divisors is an integer number (1286467208).

Almost surely, 2^3859401621 is an apocalyptic number.

It is an amenable number.

3859401621 is a deficient number, since it is larger than the sum of its proper divisors (1286467211).

3859401621 is a wasteful number, since it uses less digits than its factorization.

3859401621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286467210.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 3859401621 is about 62124.0824560009. The cubic root of 3859401621 is about 1568.5799458931.

The spelling of 3859401621 in words is "three billion, eight hundred fifty-nine million, four hundred one thousand, six hundred twenty-one".