149561220 has 96 divisors (see below), whose sum is σ = 429004800. Its totient is φ = 38922624.

The previous prime is 149561197. The next prime is 149561221. The reversal of 149561220 is 22165941.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (149561221) 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 31 ways as a sum of consecutive naturals, for example, 658747 + ... + 658973.

It is an arithmetic number, because the mean of its divisors is an integer number (4468800).

Almost surely, 2^149561220 is an apocalyptic number.

149561220 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 149561220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214502400).

149561220 is an abundant number, since it is smaller than the sum of its proper divisors (279443580).

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

149561220 is a wasteful number, since it uses less digits than its factorization.

149561220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457 (or 455 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 149561220 is about 12229.5224763684. The cubic root of 149561220 is about 530.8106971303.

The spelling of 149561220 in words is "one hundred forty-nine million, five hundred sixty-one thousand, two hundred twenty".