1206440321 has 32 divisors (see below), whose sum is σ = 1365811200. Its totient is φ = 1060171200.

The previous prime is 1206440317. The next prime is 1206440351. The reversal of 1206440321 is 1230446021.

It is not a de Polignac number, because 1206440321 - 2² = 1206440317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (1206440351) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3101195 + ... + 3101583.

It is an arithmetic number, because the mean of its divisors is an integer number (42681600).

Almost surely, 2^1206440321 is an apocalyptic number.

It is an amenable number.

1206440321 is a deficient number, since it is larger than the sum of its proper divisors (159370879).

1206440321 is a wasteful number, since it uses less digits than its factorization.

1206440321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1206440321 is about 34733.8497866275. The cubic root of 1206440321 is about 1064.5562511701.

Adding to 1206440321 its reverse (1230446021), we get a palindrome (2436886342).

The spelling of 1206440321 in words is "one billion, two hundred six million, four hundred forty thousand, three hundred twenty-one".