1213405000 has 40 divisors (see below), whose sum is σ = 2843019630. Its totient is φ = 485360000.

The previous prime is 1213404991. The next prime is 1213405001. The reversal of 1213405000 is 5043121.

It can be written as a sum of positive squares in 5 ways, for example, as 202037796 + 1011367204 = 14214^2 + 31802^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1213405001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 116341 + ... + 126340.

Almost surely, 2^1213405000 is an apocalyptic number.

1213405000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213405000 is an abundant number, since it is smaller than the sum of its proper divisors (1629614630).

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

1213405000 is an equidigital number, since it uses as much as digits as its factorization.

1213405000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242707 (or 242688 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 1213405000 is about 34833.9633116876. The cubic root of 1213405000 is about 1066.6008531442.

Adding to 1213405000 its reverse (5043121), we get a palindrome (1218448121).

The spelling of 1213405000 in words is "one billion, two hundred thirteen million, four hundred five thousand".