1455551220 has 96 divisors (see below), whose sum is σ = 4325384448. Its totient is φ = 364460032.

The previous prime is 1455551197. The next prime is 1455551231. The reversal of 1455551220 is 221555541.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 511642 + ... + 514478.

It is an arithmetic number, because the mean of its divisors is an integer number (45056088).

Almost surely, 2^1455551220 is an apocalyptic number.

1455551220 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 1455551220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2162692224).

1455551220 is an abundant number, since it is smaller than the sum of its proper divisors (2869833228).

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

1455551220 is a wasteful number, since it uses less digits than its factorization.

1455551220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3369 (or 3367 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 30.

The square root of 1455551220 is about 38151.6869876025. The cubic root of 1455551220 is about 1133.2937600561.

The spelling of 1455551220 in words is "one billion, four hundred fifty-five million, five hundred fifty-one thousand, two hundred twenty".