861942769 has 4 divisors (see below), whose sum is σ = 874082880. Its totient is φ = 849802660.

The previous prime is 861942743. The next prime is 861942797. The reversal of 861942769 is 967249168.

It is a happy number.

861942769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 861942769 - 2⁵ = 861942737 is a prime.

It is a super-2 number, since 2×861942769² = 1485890674062774722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861952769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6069949 + ... + 6070090.

It is an arithmetic number, because the mean of its divisors is an integer number (218520720).

Almost surely, 2^861942769 is an apocalyptic number.

It is an amenable number.

861942769 is a deficient number, since it is larger than the sum of its proper divisors (12140111).

861942769 is a wasteful number, since it uses less digits than its factorization.

861942769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12140110.

The product of its digits is 1306368, while the sum is 52.

The square root of 861942769 is about 29358.8618478305. The cubic root of 861942769 is about 951.6840927585.

The spelling of 861942769 in words is "eight hundred sixty-one million, nine hundred forty-two thousand, seven hundred sixty-nine".