155138445 has 48 divisors (see below), whose sum is σ = 335267712. Its totient is φ = 64471680.

The previous prime is 155138437. The next prime is 155138449. The reversal of 155138445 is 544831551.

It is not a de Polignac number, because 155138445 - 2³ = 155138437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155138449) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18922 + ... + 25851.

It is an arithmetic number, because the mean of its divisors is an integer number (6984744).

Almost surely, 2^155138445 is an apocalyptic number.

155138445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155138445 is an abundant number, since it is smaller than the sum of its proper divisors (180129267).

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

155138445 is a wasteful number, since it uses less digits than its factorization.

155138445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44802 (or 44799 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 155138445 is about 12455.4584419844. The cubic root of 155138445 is about 537.3284197248.

Adding to 155138445 its reverse (544831551), we get a palindrome (699969996).

The spelling of 155138445 in words is "one hundred fifty-five million, one hundred thirty-eight thousand, four hundred forty-five".