155859439 has 4 divisors (see below), whose sum is σ = 155939256. Its totient is φ = 155779624.

The previous prime is 155859437. The next prime is 155859443. The reversal of 155859439 is 934958551.

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 155859439 - 2¹ = 155859437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155859392 and 155859401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155859433) 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, 36904 + ... + 40909.

It is an arithmetic number, because the mean of its divisors is an integer number (38984814).

Almost surely, 2^155859439 is an apocalyptic number.

155859439 is a deficient number, since it is larger than the sum of its proper divisors (79817).

155859439 is an equidigital number, since it uses as much as digits as its factorization.

155859439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79816.

The product of its digits is 972000, while the sum is 49.

The square root of 155859439 is about 12484.3677853546. The cubic root of 155859439 is about 538.1595310542.

The spelling of 155859439 in words is "one hundred fifty-five million, eight hundred fifty-nine thousand, four hundred thirty-nine".