1206400004 has 12 divisors (see below), whose sum is σ = 2125182528. Its totient is φ = 599205000.

The previous prime is 1206399991. The next prime is 1206400007. The reversal of 1206400004 is 4000046021.

It is not an unprimeable number, because it can be changed into a prime (1206400007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 998072 + ... + 999279.

It is an arithmetic number, because the mean of its divisors is an integer number (177098544).

Almost surely, 2^1206400004 is an apocalyptic number.

It is an amenable number.

1206400004 is a deficient number, since it is larger than the sum of its proper divisors (918782524).

1206400004 is a wasteful number, since it uses less digits than its factorization.

1206400004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1997506 (or 1997504 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1206400004 is about 34733.2694113295. The cubic root of 1206400004 is about 1064.5443925389.

Adding to 1206400004 its reverse (4000046021), we get a palindrome (5206446025).

The spelling of 1206400004 in words is "one billion, two hundred six million, four hundred thousand, four".