838858421 has 8 divisors (see below), whose sum is σ = 889992000. Its totient is φ = 787923648.

The previous prime is 838858411. The next prime is 838858451. The reversal of 838858421 is 124858838.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-838858421 is a prime.

It is a super-2 number, since 2×838858421² = 1407366900965226482, 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 (838858411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40961 + ... + 57926.

It is an arithmetic number, because the mean of its divisors is an integer number (111249000).

Almost surely, 2^838858421 is an apocalyptic number.

It is an amenable number.

838858421 is a deficient number, since it is larger than the sum of its proper divisors (51133579).

838858421 is a wasteful number, since it uses less digits than its factorization.

838858421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99403.

The product of its digits is 491520, while the sum is 47.

The square root of 838858421 is about 28963.0526878642. The cubic root of 838858421 is about 943.1111720993. Note that the first 4 decimals are identical.

The spelling of 838858421 in words is "eight hundred thirty-eight million, eight hundred fifty-eight thousand, four hundred twenty-one".