155242320 has 40 divisors (see below), whose sum is σ = 481251936. Its totient is φ = 41397888.

The previous prime is 155242313. The next prime is 155242333. The reversal of 155242320 is 23242551.

It is a tau number, because it is divible by the number of its divisors (40).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323182 + ... + 323661.

Almost surely, 2^155242320 is an apocalyptic number.

155242320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155242320 is an abundant number, since it is smaller than the sum of its proper divisors (326009616).

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

155242320 is a wasteful number, since it uses less digits than its factorization.

155242320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646859 (or 646853 counting only the distinct ones).

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

The square root of 155242320 is about 12459.6276027817. The cubic root of 155242320 is about 537.4483180883.

Adding to 155242320 its reverse (23242551), we get a palindrome (178484871).

The spelling of 155242320 in words is "one hundred fifty-five million, two hundred forty-two thousand, three hundred twenty".