421420757 has 4 divisors (see below), whose sum is σ = 428329356. Its totient is φ = 414512160.

The previous prime is 421420739. The next prime is 421420763. The reversal of 421420757 is 757024124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78393316 + 343027441 = 8854^2 + 18521^2 .

It is a cyclic number.

It is not a de Polignac number, because 421420757 - 2⁶ = 421420693 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 (421420777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3454208 + ... + 3454329.

It is an arithmetic number, because the mean of its divisors is an integer number (107082339).

Almost surely, 2^421420757 is an apocalyptic number.

It is an amenable number.

421420757 is a deficient number, since it is larger than the sum of its proper divisors (6908599).

421420757 is an equidigital number, since it uses as much as digits as its factorization.

421420757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6908598.

The product of its (nonzero) digits is 15680, while the sum is 32.

The square root of 421420757 is about 20528.5351888536. The cubic root of 421420757 is about 749.7307222939.

The spelling of 421420757 in words is "four hundred twenty-one million, four hundred twenty thousand, seven hundred fifty-seven".