155015420 has 96 divisors (see below), whose sum is σ = 387072000. Its totient is φ = 52110912.

The previous prime is 155015389. The next prime is 155015429. The reversal of 155015420 is 24510551.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155015429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 404549 + ... + 404931.

It is an arithmetic number, because the mean of its divisors is an integer number (4032000).

Almost surely, 2^155015420 is an apocalyptic number.

155015420 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 155015420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193536000).

155015420 is an abundant number, since it is smaller than the sum of its proper divisors (232056580).

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

155015420 is a wasteful number, since it uses less digits than its factorization.

155015420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 456 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 155015420 is about 12450.5188646899. The cubic root of 155015420 is about 537.1863481056.

Adding to 155015420 its reverse (24510551), we get a palindrome (179525971).

The spelling of 155015420 in words is "one hundred fifty-five million, fifteen thousand, four hundred twenty".