861438 has 8 divisors (see below), whose sum is σ = 1722888. Its totient is φ = 287144.

The previous prime is 861437. The next prime is 861439. The reversal of 861438 is 834168.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (861437) and next prime (861439).

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

861438 is an admirable number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 861438.

It is not an unprimeable number, because it can be changed into a prime (861433) 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, 71781 + ... + 71792.

It is an arithmetic number, because the mean of its divisors is an integer number (215361).

2⁸⁶¹⁴³⁸ is an apocalyptic number.

861438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

861438 is a wasteful number, since it uses less digits than its factorization.

861438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143578.

The product of its digits is 4608, while the sum is 30.

The square root of 861438 is about 928.1368433588. The cubic root of 861438 is about 95.1498282111.

The spelling of 861438 in words is "eight hundred sixty-one thousand, four hundred thirty-eight".