1209398904 has 128 divisors (see below), whose sum is σ = 4065292800. Its totient is φ = 325209600.

The previous prime is 1209398899. The next prime is 1209398929. The reversal of 1209398904 is 4098939021.

It is a self number, because there is not a number n which added to its sum of digits gives 1209398904.

It is a congruent number.

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, 2179 + ... + 49229.

It is an arithmetic number, because the mean of its divisors is an integer number (31760100).

Almost surely, 2^1209398904 is an apocalyptic number.

1209398904 is a gapful number since it is divisible by the number (14) 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 1209398904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2032646400).

1209398904 is an abundant number, since it is smaller than the sum of its proper divisors (2855893896).

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

1209398904 is a wasteful number, since it uses less digits than its factorization.

1209398904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47090 (or 47080 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 1209398904 is about 34776.4130410254. The cubic root of 1209398904 is about 1065.4257532026.

The spelling of 1209398904 in words is "one billion, two hundred nine million, three hundred ninety-eight thousand, nine hundred four".