408138847 has 4 divisors (see below), whose sum is σ = 408240736. Its totient is φ = 408036960.

The previous prime is 408138827. The next prime is 408138859. The reversal of 408138847 is 748831804.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 408138847 - 2¹⁵ = 408106079 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 (408138817) 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, 44679 + ... + 53032.

It is an arithmetic number, because the mean of its divisors is an integer number (102060184).

Almost surely, 2^408138847 is an apocalyptic number.

408138847 is a deficient number, since it is larger than the sum of its proper divisors (101889).

408138847 is an equidigital number, since it uses as much as digits as its factorization.

408138847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101888.

The product of its (nonzero) digits is 172032, while the sum is 43.

The square root of 408138847 is about 20202.4465597610. The cubic root of 408138847 is about 741.7700790085.

The spelling of 408138847 in words is "four hundred eight million, one hundred thirty-eight thousand, eight hundred forty-seven".