155190420 has 144 divisors (see below), whose sum is σ = 586954368. Its totient is φ = 32244480.

The previous prime is 155190419. The next prime is 155190443. The reversal of 155190420 is 24091551.

155190420 is a `hidden beast` number, since 1 + 55 + 190 + 420 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8262 + ... + 19458.

It is an arithmetic number, because the mean of its divisors is an integer number (4076072).

Almost surely, 2^155190420 is an apocalyptic number.

155190420 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 155190420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293477184).

155190420 is an abundant number, since it is smaller than the sum of its proper divisors (431763948).

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

155190420 is a wasteful number, since it uses less digits than its factorization.

155190420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11230 (or 11225 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 155190420 is about 12457.5447019066. The cubic root of 155190420 is about 537.3884188789.

The spelling of 155190420 in words is "one hundred fifty-five million, one hundred ninety thousand, four hundred twenty".