126909890 has 16 divisors (see below), whose sum is σ = 232183800. Its totient is φ = 49931520.

The previous prime is 126909857. The next prime is 126909907. The reversal of 126909890 is 98909621.

It can be written as a sum of positive squares in 4 ways, for example, as 103571329 + 23338561 = 10177^2 + 4831^2 .

It is a super-2 number, since 2×126909890² = 32212240359624200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103415 + ... + 104634.

Almost surely, 2^126909890 is an apocalyptic number.

126909890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

126909890 is a deficient number, since it is larger than the sum of its proper divisors (105273910).

126909890 is a wasteful number, since it uses less digits than its factorization.

126909890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208117.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 126909890 is about 11265.4289754097. The cubic root of 126909890 is about 502.5336594533.

The spelling of 126909890 in words is "one hundred twenty-six million, nine hundred nine thousand, eight hundred ninety".