384140921 has 2 divisors, whose sum is σ = 384140922. Its totient is φ = 384140920.

The previous prime is 384140899. The next prime is 384140941. The reversal of 384140921 is 129041483.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 346146025 + 37994896 = 18605^2 + 6164^2 .

It is a cyclic number.

It is not a de Polignac number, because 384140921 - 2²⁶ = 317032057 is a prime.

It is not a weakly prime, because it can be changed into another prime (384140941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192070460 + 192070461.

It is an arithmetic number, because the mean of its divisors is an integer number (192070461).

Almost surely, 2^384140921 is an apocalyptic number.

It is an amenable number.

384140921 is a deficient number, since it is larger than the sum of its proper divisors (1).

384140921 is an equidigital number, since it uses as much as digits as its factorization.

384140921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 384140921 is about 19599.5132847732. The cubic root of 384140921 is about 726.9371396096.

The spelling of 384140921 in words is "three hundred eighty-four million, one hundred forty thousand, nine hundred twenty-one".