155238839 has 8 divisors (see below), whose sum is σ = 180324768. Its totient is φ = 130880160.

The previous prime is 155238829. The next prime is 155238841. The reversal of 155238839 is 938832551.

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

It is a cyclic number.

It is not a de Polignac number, because 155238839 - 2⁸ = 155238583 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155238839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155238829) 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, 181352 + ... + 182205.

It is an arithmetic number, because the mean of its divisors is an integer number (22540596).

Almost surely, 2^155238839 is an apocalyptic number.

155238839 is a deficient number, since it is larger than the sum of its proper divisors (25085929).

155238839 is an equidigital number, since it uses as much as digits as its factorization.

155238839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363625.

The product of its digits is 259200, while the sum is 44.

The square root of 155238839 is about 12459.4879108252. The cubic root of 155238839 is about 537.4443009887. Note that the first 3 decimals are identical.

The spelling of 155238839 in words is "one hundred fifty-five million, two hundred thirty-eight thousand, eight hundred thirty-nine".