387973121 has 2 divisors, whose sum is σ = 387973122. Its totient is φ = 387973120.

The previous prime is 387973093. The next prime is 387973147. The reversal of 387973121 is 121379783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 270142096 + 117831025 = 16436^2 + 10855^2 .

It is a cyclic number.

It is not a de Polignac number, because 387973121 - 2¹⁰ = 387972097 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (387973721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193986560 + 193986561.

It is an arithmetic number, because the mean of its divisors is an integer number (193986561).

It is a Proth number, since it is equal to 185 ⋅ 2²¹ + 1 and 185 < 2²¹.

Almost surely, 2^387973121 is an apocalyptic number.

It is an amenable number.

387973121 is a deficient number, since it is larger than the sum of its proper divisors (1).

387973121 is an equidigital number, since it uses as much as digits as its factorization.

387973121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 41.

The square root of 387973121 is about 19697.0333045360. The cubic root of 387973121 is about 729.3464601857.

The spelling of 387973121 in words is "three hundred eighty-seven million, nine hundred seventy-three thousand, one hundred twenty-one".