1219809420 has 72 divisors (see below), whose sum is σ = 3703269024. Its totient is φ = 325003008.

The previous prime is 1219809413. The next prime is 1219809431. The reversal of 1219809420 is 249089121.

It is a super-2 number, since 2×1219809420² = 2975870042241472800, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 287152 + ... + 291368.

It is an arithmetic number, because the mean of its divisors is an integer number (51434292).

Almost surely, 2^1219809420 is an apocalyptic number.

1219809420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1219809420 is an abundant number, since it is smaller than the sum of its proper divisors (2483459604).

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

1219809420 is a wasteful number, since it uses less digits than its factorization.

1219809420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5839 (or 5834 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 1219809420 is about 34925.7701418308. The cubic root of 1219809420 is about 1068.4740877990.

The spelling of 1219809420 in words is "one billion, two hundred nineteen million, eight hundred nine thousand, four hundred twenty".