1219205172 has 24 divisors (see below), whose sum is σ = 2848745536. Its totient is φ = 405839808.

The previous prime is 1219205161. The next prime is 1219205179. The reversal of 1219205172 is 2715029121.

It is a super-2 number, since 2×1219205172² = 2972922502863099168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219205179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61153 + ... + 78600.

Almost surely, 2^1219205172 is an apocalyptic number.

1219205172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1219205172 is an abundant number, since it is smaller than the sum of its proper divisors (1629540364).

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

1219205172 is a wasteful number, since it uses less digits than its factorization.

1219205172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140487 (or 140485 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 1219205172 is about 34917.1186096448. The cubic root of 1219205172 is about 1068.2976312817.

The spelling of 1219205172 in words is "one billion, two hundred nineteen million, two hundred five thousand, one hundred seventy-two".