1205310440 has 32 divisors (see below), whose sum is σ = 2721980160. Its totient is φ = 480340800.

The previous prime is 1205310439. The next prime is 1205310461. The reversal of 1205310440 is 440135021.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 44756 + ... + 66435.

It is an arithmetic number, because the mean of its divisors is an integer number (85061880).

Almost surely, 2^1205310440 is an apocalyptic number.

1205310440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1205310440 is an abundant number, since it is smaller than the sum of its proper divisors (1516669720).

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

1205310440 is a wasteful number, since it uses less digits than its factorization.

1205310440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111473 (or 111469 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1205310440 is about 34717.5811369398. The cubic root of 1205310440 is about 1064.2238137912.

Adding to 1205310440 its reverse (440135021), we get a palindrome (1645445461).

The spelling of 1205310440 in words is "one billion, two hundred five million, three hundred ten thousand, four hundred forty".