420509749 has 8 divisors (see below), whose sum is σ = 459423648. Its totient is φ = 381710160.

The previous prime is 420509731. The next prime is 420509753. The reversal of 420509749 is 947905024.

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 420509749 - 2⁵ = 420509717 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 (420509549) 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, 20787 + ... + 35680.

It is an arithmetic number, because the mean of its divisors is an integer number (57427956).

Almost surely, 2^420509749 is an apocalyptic number.

It is an amenable number.

420509749 is a deficient number, since it is larger than the sum of its proper divisors (38913899).

420509749 is a wasteful number, since it uses less digits than its factorization.

420509749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57155.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 420509749 is about 20506.3343628256. The cubic root of 420509749 is about 749.1900880754.

The spelling of 420509749 in words is "four hundred twenty million, five hundred nine thousand, seven hundred forty-nine".