1246665420 has 864 divisors, whose sum is σ = 5563119744. Its totient is φ = 218972160.

The previous prime is 1246665419. The next prime is 1246665421. The reversal of 1246665420 is 245666421.

It is an interprime number because it is at equal distance from previous prime (1246665419) and next prime (1246665421).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1246665421) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 33693642 + ... + 33693678.

It is an arithmetic number, because the mean of its divisors is an integer number (6438796).

Almost surely, 2^1246665420 is an apocalyptic number.

1246665420 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 1246665420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2781559872).

1246665420 is an abundant number, since it is smaller than the sum of its proper divisors (4316454324).

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

1246665420 is a wasteful number, since it uses less digits than its factorization.

1246665420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 1246665420 is about 35308.1494842196. The cubic root of 1246665420 is about 1076.2586073361.

It can be divided in two parts, 1246 and 665420, that added together give a palindrome (666666).

The spelling of 1246665420 in words is "one billion, two hundred forty-six million, six hundred sixty-five thousand, four hundred twenty".