427737921709 has 12 divisors (see below), whose sum is σ = 498813536988. Its totient is φ = 365718192000.

The previous prime is 427737921701. The next prime is 427737921719. The reversal of 427737921709 is 907129737724.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 344543172484 + 83194749225 = 586978^2 + 288435^2 .

It is not a de Polignac number, because 427737921709 - 2³ = 427737921701 is a prime.

It is a super-2 number, since 2×427737921709² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427737921701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10864822 + ... + 10904119.

It is an arithmetic number, because the mean of its divisors is an integer number (41567794749).

Almost surely, 2^427737921709 is an apocalyptic number.

427737921709 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

427737921709 is a deficient number, since it is larger than the sum of its proper divisors (71075615279).

427737921709 is a wasteful number, since it uses less digits than its factorization.

427737921709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21769356 (or 21769349 counting only the distinct ones).

The product of its (nonzero) digits is 9335088, while the sum is 58.

The spelling of 427737921709 in words is "four hundred twenty-seven billion, seven hundred thirty-seven million, nine hundred twenty-one thousand, seven hundred nine".