126261640 has 16 divisors (see below), whose sum is σ = 284088780. Its totient is φ = 50504640.

The previous prime is 126261637. The next prime is 126261647. The reversal of 126261640 is 46162621.

It can be written as a sum of positive squares in 2 ways, for example, as 109956196 + 16305444 = 10486^2 + 4038^2 .

It is a junction number, because it is equal to n+sod(n) for n = 126261599 and 126261608.

It is not an unprimeable number, because it can be changed into a prime (126261647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1578231 + ... + 1578310.

Almost surely, 2^126261640 is an apocalyptic number.

126261640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126261640 is an abundant number, since it is smaller than the sum of its proper divisors (157827140).

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

126261640 is a wasteful number, since it uses less digits than its factorization.

126261640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3156552 (or 3156548 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 126261640 is about 11236.6204883853. The cubic root of 126261640 is about 501.6765586852.

The spelling of 126261640 in words is "one hundred twenty-six million, two hundred sixty-one thousand, six hundred forty".