155438238 has 16 divisors (see below), whose sum is σ = 311181696. Its totient is φ = 51761880.

The previous prime is 155438237. The next prime is 155438263. The reversal of 155438238 is 832834551.

155438238 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×155438238² = 48322091665089288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155438196 and 155438205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155438237) 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, 5808 + ... + 18563.

It is an arithmetic number, because the mean of its divisors is an integer number (19448856).

Almost surely, 2^155438238 is an apocalyptic number.

155438238 is an abundant number, since it is smaller than the sum of its proper divisors (155743458).

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

155438238 is a wasteful number, since it uses less digits than its factorization.

155438238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25439.

The product of its digits is 115200, while the sum is 39.

The square root of 155438238 is about 12467.4872368092. The cubic root of 155438238 is about 537.6743121680.

The spelling of 155438238 in words is "one hundred fifty-five million, four hundred thirty-eight thousand, two hundred thirty-eight".