155440100 has 18 divisors (see below), whose sum is σ = 337305234. Its totient is φ = 62176000.

The previous prime is 155440097. The next prime is 155440123. The reversal of 155440100 is 1044551.

155440100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 88804 + 155351296 = 298^2 + 12464^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 777101 + ... + 777300.

Almost surely, 2^155440100 is an apocalyptic number.

155440100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155440100 is an abundant number, since it is smaller than the sum of its proper divisors (181865134).

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

155440100 is a wasteful number, since it uses less digits than its factorization.

155440100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554415 (or 1554408 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 155440100 is about 12467.5619108148. The cubic root of 155440100 is about 537.6764590991.

Adding to 155440100 its reverse (1044551), we get a palindrome (156484651).

The spelling of 155440100 in words is "one hundred fifty-five million, four hundred forty thousand, one hundred".