1209420 has 36 divisors (see below), whose sum is σ = 3669120. Its totient is φ = 322464.

The previous prime is 1209379. The next prime is 1209427. The reversal of 1209420 is 249021.

1209420 = 154² + 155² + ... + 193².

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1209393 and 1209402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209427) 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, 3180 + ... + 3539.

It is an arithmetic number, because the mean of its divisors is an integer number (101920).

2^1209420 is an apocalyptic number.

1209420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1209420 is an abundant number, since it is smaller than the sum of its proper divisors (2459700).

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

1209420 is a wasteful number, since it uses less digits than its factorization.

1209420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6734 (or 6729 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1209420 is about 1099.7363320360. The cubic root of 1209420 is about 106.5431948041.

The spelling of 1209420 in words is "one million, two hundred nine thousand, four hundred twenty".