839906420 has 24 divisors (see below), whose sum is σ = 1867557384. Its totient is φ = 316199936.

The previous prime is 839906411. The next prime is 839906429. The reversal of 839906420 is 24609938.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (839906411) and next prime (839906429).

It can be written as a sum of positive squares in 4 ways, for example, as 249513616 + 590392804 = 15796^2 + 24298^2 .

It is a super-4 number, since 4×839906420⁴ (a number of 37 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (839906429) 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, 1234817 + ... + 1235496.

It is an arithmetic number, because the mean of its divisors is an integer number (77814891).

Almost surely, 2^839906420 is an apocalyptic number.

It is an amenable number.

839906420 is an abundant number, since it is smaller than the sum of its proper divisors (1027650964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

839906420 is a wasteful number, since it uses less digits than its factorization.

839906420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470339 (or 2470337 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 839906420 is about 28981.1390390371. The cubic root of 839906420 is about 943.5037565238.

The spelling of 839906420 in words is "eight hundred thirty-nine million, nine hundred six thousand, four hundred twenty".