385025821 has 2 divisors, whose sum is σ = 385025822. Its totient is φ = 385025820.

The previous prime is 385025813. The next prime is 385025857. The reversal of 385025821 is 128520583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 265364100 + 119661721 = 16290^2 + 10939^2 .

It is a cyclic number.

It is not a de Polignac number, because 385025821 - 2³ = 385025813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385005821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192512910 + 192512911.

It is an arithmetic number, because the mean of its divisors is an integer number (192512911).

Almost surely, 2^385025821 is an apocalyptic number.

It is an amenable number.

385025821 is a deficient number, since it is larger than the sum of its proper divisors (1).

385025821 is an equidigital number, since it uses as much as digits as its factorization.

385025821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 385025821 is about 19622.0748393232. The cubic root of 385025821 is about 727.4948979146.

The spelling of 385025821 in words is "three hundred eighty-five million, twenty-five thousand, eight hundred twenty-one".