1204555440 has 160 divisors (see below), whose sum is σ = 4097952000. Its totient is φ = 290268160.

The previous prime is 1204555427. The next prime is 1204555453. The reversal of 1204555440 is 445554021.

It is an interprime number because it is at equal distance from previous prime (1204555427) and next prime (1204555453).

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

It is a junction number, because it is equal to n+sod(n) for n = 1204555398 and 1204555407.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 471286 + ... + 473834.

It is an arithmetic number, because the mean of its divisors is an integer number (25612200).

Almost surely, 2^1204555440 is an apocalyptic number.

1204555440 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 1204555440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2048976000).

1204555440 is an abundant number, since it is smaller than the sum of its proper divisors (2893396560).

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

1204555440 is a wasteful number, since it uses less digits than its factorization.

1204555440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2755 (or 2749 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

The square root of 1204555440 is about 34706.7059802569. The cubic root of 1204555440 is about 1064.0015593472.

The spelling of 1204555440 in words is "one billion, two hundred four million, five hundred fifty-five thousand, four hundred forty".