155520440 has 32 divisors (see below), whose sum is σ = 350498880. Its totient is φ = 62105472.

The previous prime is 155520373. The next prime is 155520451. The reversal of 155520440 is 44025551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24209 + ... + 29951.

It is an arithmetic number, because the mean of its divisors is an integer number (10953090).

Almost surely, 2^155520440 is an apocalyptic number.

155520440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155520440 is an abundant number, since it is smaller than the sum of its proper divisors (194978440).

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

155520440 is a wasteful number, since it uses less digits than its factorization.

155520440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6431 (or 6427 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 155520440 is about 12470.7834557417. The cubic root of 155520440 is about 537.7690767412.

Adding to 155520440 its reverse (44025551), we get a palindrome (199545991).

The spelling of 155520440 in words is "one hundred fifty-five million, five hundred twenty thousand, four hundred forty".