47255821 has 16 divisors (see below), whose sum is σ = 50077440. Its totient is φ = 44542720.

The previous prime is 47255783. The next prime is 47255827. The reversal of 47255821 is 12855274.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 47255821 - 2⁷ = 47255693 is a prime.

It is a super-2 number, since 2×47255821² = 4466225236768082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47255827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263910 + ... + 264088.

It is an arithmetic number, because the mean of its divisors is an integer number (3129840).

Almost surely, 2^47255821 is an apocalyptic number.

47255821 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

47255821 is a deficient number, since it is larger than the sum of its proper divisors (2821619).

47255821 is a wasteful number, since it uses less digits than its factorization.

47255821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404.

The product of its digits is 22400, while the sum is 34.

The square root of 47255821 is about 6874.2869448402. The cubic root of 47255821 is about 361.5361849829.

The spelling of 47255821 in words is "forty-seven million, two hundred fifty-five thousand, eight hundred twenty-one".