126978140 has 72 divisors (see below), whose sum is σ = 288676080. Its totient is φ = 46884096.

The previous prime is 126978113. The next prime is 126978167. The reversal of 126978140 is 41879621.

It is an interprime number because it is at equal distance from previous prime (126978113) and next prime (126978167).

It is a super-2 number, since 2×126978140² = 32246896075719200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 126978094 and 126978103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 310256 + ... + 310664.

It is an arithmetic number, because the mean of its divisors is an integer number (4009390).

Almost surely, 2^126978140 is an apocalyptic number.

126978140 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 126978140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144338040).

126978140 is an abundant number, since it is smaller than the sum of its proper divisors (161697940).

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

126978140 is a wasteful number, since it uses less digits than its factorization.

126978140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 126978140 is about 11268.4577471808. The cubic root of 126978140 is about 502.6237280204.

The spelling of 126978140 in words is "one hundred twenty-six million, nine hundred seventy-eight thousand, one hundred forty".