1212153400 has 48 divisors (see below), whose sum is σ = 2824584840. Its totient is φ = 483772800.

The previous prime is 1212153367. The next prime is 1212153401. The reversal of 1212153400 is 43512121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212153401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85627 + ... + 98773.

Almost surely, 2^1212153400 is an apocalyptic number.

1212153400 is a gapful number since it is divisible by the number (10) 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 1212153400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1412292420).

1212153400 is an abundant number, since it is smaller than the sum of its proper divisors (1612431440).

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

1212153400 is a wasteful number, since it uses less digits than its factorization.

1212153400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13624 (or 13615 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1212153400 is about 34815.9934512861. The cubic root of 1212153400 is about 1066.2340020423.

Adding to 1212153400 its reverse (43512121), we get a palindrome (1255665521).

The spelling of 1212153400 in words is "one billion, two hundred twelve million, one hundred fifty-three thousand, four hundred".