155233420 has 48 divisors (see below), whose sum is σ = 347558400. Its totient is φ = 58069440.

The previous prime is 155233391. The next prime is 155233427. The reversal of 155233420 is 24332551.

155233420 = 1231² + 1232² + ... + 1325².

155233420 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (155233427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27435 + ... + 32605.

It is an arithmetic number, because the mean of its divisors is an integer number (7240800).

Almost surely, 2^155233420 is an apocalyptic number.

155233420 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 155233420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173779200).

155233420 is an abundant number, since it is smaller than the sum of its proper divisors (192324980).

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

155233420 is a wasteful number, since it uses less digits than its factorization.

155233420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278 (or 5276 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 155233420 is about 12459.2704441311. The cubic root of 155233420 is about 537.4380473034.

Adding to 155233420 its reverse (24332551), we get a palindrome (179565971).

The spelling of 155233420 in words is "one hundred fifty-five million, two hundred thirty-three thousand, four hundred twenty".