1455155220 has 24 divisors (see below), whose sum is σ = 4074434784. Its totient is φ = 388041376.

The previous prime is 1455155213. The next prime is 1455155249. The reversal of 1455155220 is 225515541.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12126234 + ... + 12126353.

It is an arithmetic number, because the mean of its divisors is an integer number (169768116).

Almost surely, 2^1455155220 is an apocalyptic number.

1455155220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1455155220 is an abundant number, since it is smaller than the sum of its proper divisors (2619279564).

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

1455155220 is a wasteful number, since it uses less digits than its factorization.

1455155220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24252599 (or 24252597 counting only the distinct ones).

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

The square root of 1455155220 is about 38146.4968247413. The cubic root of 1455155220 is about 1133.1909753910.

The spelling of 1455155220 in words is "one billion, four hundred fifty-five million, one hundred fifty-five thousand, two hundred twenty".