1219640234 has 8 divisors (see below), whose sum is σ = 1832042820. Its totient is φ = 608959296.

The previous prime is 1219640209. The next prime is 1219640237. The reversal of 1219640234 is 4320469121.

It can be written as a sum of positive squares in 2 ways, for example, as 1189905025 + 29735209 = 34495^2 + 5453^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1219640234.

It is not an unprimeable number, because it can be changed into a prime (1219640237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 428639 + ... + 431474.

Almost surely, 2^1219640234 is an apocalyptic number.

1219640234 is a deficient number, since it is larger than the sum of its proper divisors (612402586).

1219640234 is an equidigital number, since it uses as much as digits as its factorization.

1219640234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860824.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 1219640234 is about 34923.3479781077. The cubic root of 1219640234 is about 1068.4246868537.

The spelling of 1219640234 in words is "one billion, two hundred nineteen million, six hundred forty thousand, two hundred thirty-four".