155402220 has 48 divisors (see below), whose sum is σ = 446892768. Its totient is φ = 40320000.

The previous prime is 155402209. The next prime is 155402227. The reversal of 155402220 is 22204551.

It is a happy number.

155402220 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 (155402227) 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, 32781 + ... + 37220.

It is an arithmetic number, because the mean of its divisors is an integer number (9310266).

Almost surely, 2^155402220 is an apocalyptic number.

155402220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155402220 is an abundant number, since it is smaller than the sum of its proper divisors (291490548).

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

155402220 is a wasteful number, since it uses less digits than its factorization.

155402220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70050 (or 70048 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 155402220 is about 12466.0426760059. The cubic root of 155402220 is about 537.6327791672.

Adding to 155402220 its reverse (22204551), we get a palindrome (177606771).

The spelling of 155402220 in words is "one hundred fifty-five million, four hundred two thousand, two hundred twenty".