126969780 has 144 divisors (see below), whose sum is σ = 435516480. Its totient is φ = 27482112.

The previous prime is 126969779. The next prime is 126969781. The reversal of 126969780 is 87969621.

It is an interprime number because it is at equal distance from previous prime (126969779) and next prime (126969781).

It is a super-2 number, since 2×126969780² = 32242650066496800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126969781) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54724 + ... + 56996.

It is an arithmetic number, because the mean of its divisors is an integer number (3024420).

Almost surely, 2^126969780 is an apocalyptic number.

126969780 is a gapful number since it is divisible by the number (10) 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 126969780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217758240).

126969780 is an abundant number, since it is smaller than the sum of its proper divisors (308546700).

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

126969780 is a wasteful number, since it uses less digits than its factorization.

126969780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2318 (or 2309 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 126969780 is about 11268.0867941279. The cubic root of 126969780 is about 502.6126971805.

The spelling of 126969780 in words is "one hundred twenty-six million, nine hundred sixty-nine thousand, seven hundred eighty".