3934415921 has 4 divisors (see below), whose sum is σ = 3934883952. Its totient is φ = 3933947892.

The previous prime is 3934415887. The next prime is 3934415951. The reversal of 3934415921 is 1295144393.

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: 1295144393 = 317 ⋅4085629.

It is a cyclic number.

It is not a de Polignac number, because 3934415921 - 2¹⁴ = 3934399537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3934415951) 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, 221171 + ... + 238296.

It is an arithmetic number, because the mean of its divisors is an integer number (983720988).

Almost surely, 2^3934415921 is an apocalyptic number.

It is an amenable number.

3934415921 is a deficient number, since it is larger than the sum of its proper divisors (468031).

3934415921 is an equidigital number, since it uses as much as digits as its factorization.

3934415921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468030.

The product of its digits is 116640, while the sum is 41.

The square root of 3934415921 is about 62724.9226464250. The cubic root of 3934415921 is about 1578.6775133781.

The spelling of 3934415921 in words is "three billion, nine hundred thirty-four million, four hundred fifteen thousand, nine hundred twenty-one".