126421757 has 8 divisors (see below), whose sum is σ = 157616832. Its totient is φ = 98510400.

The previous prime is 126421747. The next prime is 126421781. The reversal of 126421757 is 757124621.

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

It is a cyclic number.

It is not a de Polignac number, because 126421757 - 2⁶ = 126421693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126421717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 820844 + ... + 820997.

It is an arithmetic number, because the mean of its divisors is an integer number (19702104).

Almost surely, 2^126421757 is an apocalyptic number.

It is an amenable number.

126421757 is a deficient number, since it is larger than the sum of its proper divisors (31195075).

126421757 is a wasteful number, since it uses less digits than its factorization.

126421757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641859.

The product of its digits is 23520, while the sum is 35.

The square root of 126421757 is about 11243.7430155620. The cubic root of 126421757 is about 501.8885338987. Note that the first 3 decimals are identical.

The spelling of 126421757 in words is "one hundred twenty-six million, four hundred twenty-one thousand, seven hundred fifty-seven".