3820439921 has 16 divisors (see below), whose sum is σ = 4040889600. Its totient is φ = 3607763328.

The previous prime is 3820439893. The next prime is 3820439933. The reversal of 3820439921 is 1299340283.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3820439921 is a prime.

It is a super-2 number, since 2×3820439921² = 29191522379940972482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3820439941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161381 + ... + 183533.

It is an arithmetic number, because the mean of its divisors is an integer number (252555600).

Almost surely, 2^3820439921 is an apocalyptic number.

It is an amenable number.

3820439921 is a deficient number, since it is larger than the sum of its proper divisors (220449679).

3820439921 is a wasteful number, since it uses less digits than its factorization.

3820439921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22328.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 3820439921 is about 61809.7073363076. The cubic root of 3820439921 is about 1563.2836707653.

It can be divided in two parts, 38204 and 39921, that added together give a 7-th power (78125 = 5⁷).

The spelling of 3820439921 in words is "three billion, eight hundred twenty million, four hundred thirty-nine thousand, nine hundred twenty-one".