538071821 has 12 divisors (see below), whose sum is σ = 642842592. Its totient is φ = 441149016.

The previous prime is 538071817. The next prime is 538071869. The reversal of 538071821 is 128170835.

It is not a de Polignac number, because 538071821 - 2² = 538071817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538071881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68951 + ... + 76356.

It is an arithmetic number, because the mean of its divisors is an integer number (53570216).

Almost surely, 2^538071821 is an apocalyptic number.

It is an amenable number.

538071821 is a deficient number, since it is larger than the sum of its proper divisors (104770771).

538071821 is a wasteful number, since it uses less digits than its factorization.

538071821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145360 (or 145337 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 538071821 is about 23196.3751694096. The cubic root of 538071821 is about 813.3548914640.

The spelling of 538071821 in words is "five hundred thirty-eight million, seventy-one thousand, eight hundred twenty-one".