126840565 has 8 divisors (see below), whose sum is σ = 152998488. Its totient is φ = 100945920.

The previous prime is 126840559. The next prime is 126840589. The reversal of 126840565 is 565048621.

It can be written as a sum of positive squares in 4 ways, for example, as 7921 + 126832644 = 89^2 + 11262^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 126840565 - 2³ = 126840557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64756 + ... + 66685.

It is an arithmetic number, because the mean of its divisors is an integer number (19124811).

Almost surely, 2^126840565 is an apocalyptic number.

It is an amenable number.

126840565 is a deficient number, since it is larger than the sum of its proper divisors (26157923).

126840565 is a wasteful number, since it uses less digits than its factorization.

126840565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131639.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 126840565 is about 11262.3516638400. The cubic root of 126840565 is about 502.4421391593.

The spelling of 126840565 in words is "one hundred twenty-six million, eight hundred forty thousand, five hundred sixty-five".