1045401220 has 48 divisors (see below), whose sum is σ = 2273822208. Its totient is φ = 403303680.

The previous prime is 1045401211. The next prime is 1045401239. The reversal of 1045401220 is 221045401.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191367 + ... + 196753.

It is an arithmetic number, because the mean of its divisors is an integer number (47371296).

Almost surely, 2^1045401220 is an apocalyptic number.

1045401220 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 1045401220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1136911104).

1045401220 is an abundant number, since it is smaller than the sum of its proper divisors (1228420988).

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

1045401220 is a wasteful number, since it uses less digits than its factorization.

1045401220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5740 (or 5738 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 1045401220 is about 32332.6649071802. The cubic root of 1045401220 is about 1014.9103174905.

Adding to 1045401220 its reverse (221045401), we get a palindrome (1266446621).

The spelling of 1045401220 in words is "one billion, forty-five million, four hundred one thousand, two hundred twenty".