1205479640 has 32 divisors (see below), whose sum is σ = 2799826560. Its totient is φ = 466636800.

The previous prime is 1205479631. The next prime is 1205479651. The reversal of 1205479640 is 469745021.

It is a junction number, because it is equal to n+sod(n) for n = 1205479594 and 1205479603.

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, 484841 + ... + 487320.

It is an arithmetic number, because the mean of its divisors is an integer number (87494580).

Almost surely, 2^1205479640 is an apocalyptic number.

1205479640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1205479640 is an abundant number, since it is smaller than the sum of its proper divisors (1594346920).

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

1205479640 is a wasteful number, since it uses less digits than its factorization.

1205479640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972203 (or 972199 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 1205479640 is about 34720.0178571383. The cubic root of 1205479640 is about 1064.2736096053.

The spelling of 1205479640 in words is "one billion, two hundred five million, four hundred seventy-nine thousand, six hundred forty".