1269242172 has 72 divisors (see below), whose sum is σ = 3539455920. Its totient is φ = 380286720.

The previous prime is 1269242141. The next prime is 1269242179. The reversal of 1269242172 is 2712429621.

1269242172 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1269242172² = 3221951382366555168, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1269242179) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17238 + ... + 53250.

It is an arithmetic number, because the mean of its divisors is an integer number (49159110).

Almost surely, 2^1269242172 is an apocalyptic number.

1269242172 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 1269242172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1769727960).

1269242172 is an abundant number, since it is smaller than the sum of its proper divisors (2270213748).

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

1269242172 is a wasteful number, since it uses less digits than its factorization.

1269242172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36123 (or 36118 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 1269242172 is about 35626.4251925449. The cubic root of 1269242172 is about 1082.7166893719.

The spelling of 1269242172 in words is "one billion, two hundred sixty-nine million, two hundred forty-two thousand, one hundred seventy-two".