385942385621 has 4 divisors (see below), whose sum is σ = 415630261452. Its totient is φ = 356254509792.

The previous prime is 385942385561. The next prime is 385942385651. The reversal of 385942385621 is 126583249583.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126583249583 = 7 ⋅18083321369.

It can be written as a sum of positive squares in 2 ways, for example, as 232661522500 + 153280863121 = 482350^2 + 391511^2 .

It is a cyclic number.

It is not a de Polignac number, because 385942385621 - 2³⁸ = 111064478677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385942385651) 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, 14843937896 + ... + 14843937921.

It is an arithmetic number, because the mean of its divisors is an integer number (103907565363).

Almost surely, 2^385942385621 is an apocalyptic number.

It is an amenable number.

385942385621 is a deficient number, since it is larger than the sum of its proper divisors (29687875831).

385942385621 is a wasteful number, since it uses less digits than its factorization.

385942385621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29687875830.

The product of its digits is 12441600, while the sum is 56.

The spelling of 385942385621 in words is "three hundred eighty-five billion, nine hundred forty-two million, three hundred eighty-five thousand, six hundred twenty-one".