155342440 has 128 divisors (see below), whose sum is σ = 399168000. Its totient is φ = 53913600.

The previous prime is 155342393. The next prime is 155342441. The reversal of 155342440 is 44243551.

It is a junction number, because it is equal to n+sod(n) for n = 155342399 and 155342408.

It is not an unprimeable number, because it can be changed into a prime (155342441) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1425106 + ... + 1425214.

It is an arithmetic number, because the mean of its divisors is an integer number (3118500).

Almost surely, 2^155342440 is an apocalyptic number.

155342440 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 155342440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199584000).

155342440 is an abundant number, since it is smaller than the sum of its proper divisors (243825560).

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

155342440 is a wasteful number, since it uses less digits than its factorization.

155342440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 155342440 is about 12463.6447317789. The cubic root of 155342440 is about 537.5638316116.

Adding to 155342440 its reverse (44243551), we get a palindrome (199585991).

The spelling of 155342440 in words is "one hundred fifty-five million, three hundred forty-two thousand, four hundred forty".