155003420 has 108 divisors (see below), whose sum is σ = 388450440. Its totient is φ = 51891840.

The previous prime is 155003369. The next prime is 155003423. The reversal of 155003420 is 24300551.

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

It is a junction number, because it is equal to n+sod(n) for n = 155003392 and 155003401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155003423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 408791 + ... + 409169.

Almost surely, 2^155003420 is an apocalyptic number.

155003420 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 155003420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194225220).

155003420 is an abundant number, since it is smaller than the sum of its proper divisors (233447020).

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

155003420 is a wasteful number, since it uses less digits than its factorization.

155003420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 155003420 is about 12450.0369477363. The cubic root of 155003420 is about 537.1724862534.

Adding to 155003420 its reverse (24300551), we get a palindrome (179303971).

The spelling of 155003420 in words is "one hundred fifty-five million, three thousand, four hundred twenty".