155213420 has 12 divisors (see below), whose sum is σ = 325948224. Its totient is φ = 62085360.

The previous prime is 155213381. The next prime is 155213437. The reversal of 155213420 is 24312551.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3880316 + ... + 3880355.

It is an arithmetic number, because the mean of its divisors is an integer number (27162352).

Almost surely, 2^155213420 is an apocalyptic number.

155213420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155213420 is an abundant number, since it is smaller than the sum of its proper divisors (170734804).

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

155213420 is a wasteful number, since it uses less digits than its factorization.

155213420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7760680 (or 7760678 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 155213420 is about 12458.4678030647. The cubic root of 155213420 is about 537.4149654554.

Adding to 155213420 its reverse (24312551), we get a palindrome (179525971).

The spelling of 155213420 in words is "one hundred fifty-five million, two hundred thirteen thousand, four hundred twenty".