155019240 has 96 divisors (see below), whose sum is σ = 511411680. Its totient is φ = 40715136.

The previous prime is 155019187. The next prime is 155019247. The reversal of 155019240 is 42910551.

It is not an unprimeable number, because it can be changed into a prime (155019247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20907 + ... + 27333.

It is an arithmetic number, because the mean of its divisors is an integer number (5327205).

Almost surely, 2^155019240 is an apocalyptic number.

155019240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155019240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255705840).

155019240 is an abundant number, since it is smaller than the sum of its proper divisors (356392440).

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

155019240 is a wasteful number, since it uses less digits than its factorization.

155019240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6511 (or 6504 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 155019240 is about 12450.6722710061. The cubic root of 155019240 is about 537.1907606451.

Adding to 155019240 its reverse (42910551), we get a palindrome (197929791).

The spelling of 155019240 in words is "one hundred fifty-five million, nineteen thousand, two hundred forty".