1269189972 has 144 divisors (see below), whose sum is σ = 3487457792. Its totient is φ = 403107840.

The previous prime is 1269189931. The next prime is 1269189983. The reversal of 1269189972 is 2799819621.

It is a super-3 number, since 3×1269189972³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2199348 + ... + 2199924.

Almost surely, 2^1269189972 is an apocalyptic number.

1269189972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1269189972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1743728896).

1269189972 is an abundant number, since it is smaller than the sum of its proper divisors (2218267820).

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

1269189972 is a wasteful number, since it uses less digits than its factorization.

1269189972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700 (or 686 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 1269189972 is about 35625.6925827415. The cubic root of 1269189972 is about 1082.7018462402.

The spelling of 1269189972 in words is "one billion, two hundred sixty-nine million, one hundred eighty-nine thousand, nine hundred seventy-two".