155413440 has 336 divisors, whose sum is σ = 659026368. Its totient is φ = 32735232.

The previous prime is 155413409. The next prime is 155413451. The reversal of 155413440 is 44314551.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (336).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 261784 + ... + 262376.

It is an arithmetic number, because the mean of its divisors is an integer number (1961388).

Almost surely, 2^155413440 is an apocalyptic number.

155413440 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 155413440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329513184).

155413440 is an abundant number, since it is smaller than the sum of its proper divisors (503612928).

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

155413440 is a wasteful number, since it uses less digits than its factorization.

155413440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636 (or 623 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 155413440 is about 12466.4926904082. The cubic root of 155413440 is about 537.6457178382.

Adding to 155413440 its reverse (44314551), we get a palindrome (199727991).

It can be divided in two parts, 15541 and 3440, that added together give a palindrome (18981).

The spelling of 155413440 in words is "one hundred fifty-five million, four hundred thirteen thousand, four hundred forty".