155420900 has 36 divisors (see below), whose sum is σ = 338715300. Its totient is φ = 61900800.

The previous prime is 155420891. The next prime is 155420929. The reversal of 155420900 is 9024551.

It can be written as a sum of positive squares in 6 ways, for example, as 13191424 + 142229476 = 3632^2 + 11926^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 155420900.

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 11 ways as a sum of consecutive naturals, for example, 20876 + ... + 27324.

Almost surely, 2^155420900 is an apocalyptic number.

155420900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155420900 is an abundant number, since it is smaller than the sum of its proper divisors (183294400).

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

155420900 is a wasteful number, since it uses less digits than its factorization.

155420900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6704 (or 6697 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 155420900 is about 12466.7918888542. The cubic root of 155420900 is about 537.6543202107.

The spelling of 155420900 in words is "one hundred fifty-five million, four hundred twenty thousand, nine hundred".