155550440 has 16 divisors (see below), whose sum is σ = 349988580. Its totient is φ = 62220160.

The previous prime is 155550413. The next prime is 155550457. The reversal of 155550440 is 44055551.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 153412996 + 2137444 = 12386^2 + 1462^2 .

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 3 ways as a sum of consecutive naturals, for example, 1944341 + ... + 1944420.

Almost surely, 2^155550440 is an apocalyptic number.

155550440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155550440 is an abundant number, since it is smaller than the sum of its proper divisors (194438140).

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

155550440 is a wasteful number, since it uses less digits than its factorization.

155550440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3888772 (or 3888768 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 155550440 is about 12471.9862091008. The cubic root of 155550440 is about 537.8036531932.

The spelling of 155550440 in words is "one hundred fifty-five million, five hundred fifty thousand, four hundred forty".