126043665 has 16 divisors (see below), whose sum is σ = 220003776. Its totient is φ = 61112000.

The previous prime is 126043649. The next prime is 126043691. The reversal of 126043665 is 566340621.

It is not a de Polignac number, because 126043665 - 2⁴ = 126043649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 381786 + ... + 382115.

It is an arithmetic number, because the mean of its divisors is an integer number (13750236).

Almost surely, 2^126043665 is an apocalyptic number.

126043665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

126043665 is a deficient number, since it is larger than the sum of its proper divisors (93960111).

126043665 is a wasteful number, since it uses less digits than its factorization.

126043665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763920.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 126043665 is about 11226.9169855308. The cubic root of 126043665 is about 501.3876983568.

The spelling of 126043665 in words is "one hundred twenty-six million, forty-three thousand, six hundred sixty-five".