1212393420 has 480 divisors, whose sum is σ = 4859205120. Its totient is φ = 246343680.

The previous prime is 1212393409. The next prime is 1212393431. The reversal of 1212393420 is 243932121.

It is a happy number.

1212393420 is a `hidden beast` number, since 1 + 2 + 1 + 239 + 3 + 420 = 666.

It is an interprime number because it is at equal distance from previous prime (1212393409) and next prime (1212393431).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 3662655 + ... + 3662985.

It is an arithmetic number, because the mean of its divisors is an integer number (10123344).

Almost surely, 2^1212393420 is an apocalyptic number.

1212393420 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 1212393420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2429602560).

1212393420 is an abundant number, since it is smaller than the sum of its proper divisors (3646811700).

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

1212393420 is a wasteful number, since it uses less digits than its factorization.

1212393420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 1212393420 is about 34819.4402597170. The cubic root of 1212393420 is about 1066.3043728374.

The spelling of 1212393420 in words is "one billion, two hundred twelve million, three hundred ninety-three thousand, four hundred twenty".