1200420420 has 48 divisors (see below), whose sum is σ = 3432699648. Its totient is φ = 313300480.

The previous prime is 1200420407. The next prime is 1200420433. The reversal of 1200420420 is 240240021.

It is an interprime number because it is at equal distance from previous prime (1200420407) and next prime (1200420433).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1200420420.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210021 + ... + 215660.

It is an arithmetic number, because the mean of its divisors is an integer number (71514576).

Almost surely, 2^1200420420 is an apocalyptic number.

1200420420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200420420 is an abundant number, since it is smaller than the sum of its proper divisors (2232279228).

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

1200420420 is a wasteful number, since it uses less digits than its factorization.

1200420420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425740 (or 425738 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 1200420420 is about 34647.0838599730. The cubic root of 1200420420 is about 1062.7826555024.

Adding to 1200420420 its reverse (240240021), we get a palindrome (1440660441).

The spelling of 1200420420 in words is "one billion, two hundred million, four hundred twenty thousand, four hundred twenty".