42698849769 has 9 divisors (see below), whose sum is σ = 61677011773. Its totient is φ = 28465486572.

The previous prime is 42698849761. The next prime is 42698849819. The reversal of 42698849769 is 96794889624.

The square root of 42698849769 is 206637.

It is a perfect power (a square), and thus also a powerful number.

42698849769 is a `hidden beast` number, since 42 + 6 + 98 + 8 + 497 + 6 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 42698849769 - 2³ = 42698849761 is a prime.

It is a super-2 number, since 2×42698849769² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42698849697 and 42698849706.

It is not an unprimeable number, because it can be changed into a prime (42698849761) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 585472 + ... + 654350.

Almost surely, 2^42698849769 is an apocalyptic number.

42698849769 is the 206637-th square number.

42698849769 is the 103319-th centered octagonal number.

It is an amenable number.

42698849769 is a deficient number, since it is larger than the sum of its proper divisors (18978162004).

42698849769 is an frugal number, since it uses more digits than its factorization.

42698849769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137764 (or 68882 counting only the distinct ones).

The product of its digits is 376233984, while the sum is 72.

The spelling of 42698849769 in words is "forty-two billion, six hundred ninety-eight million, eight hundred forty-nine thousand, seven hundred sixty-nine".