155232240 has 80 divisors (see below), whose sum is σ = 482433408. Its totient is φ = 41291008.

The previous prime is 155232179. The next prime is 155232247. The reversal of 155232240 is 42232551.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 155232240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155232247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163447 + ... + 164393.

Almost surely, 2^155232240 is an apocalyptic number.

155232240 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 155232240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241216704).

155232240 is an abundant number, since it is smaller than the sum of its proper divisors (327201168).

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

155232240 is a wasteful number, since it uses less digits than its factorization.

155232240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646 (or 1640 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 155232240 is about 12459.2230897436. The cubic root of 155232240 is about 537.4366855294.

Adding to 155232240 its reverse (42232551), we get a palindrome (197464791).

The spelling of 155232240 in words is "one hundred fifty-five million, two hundred thirty-two thousand, two hundred forty".