861338477 has 4 divisors (see below), whose sum is σ = 898788000. Its totient is φ = 823888956.

The previous prime is 861338459. The next prime is 861338539. The reversal of 861338477 is 774833168.

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 861338477 - 2²⁸ = 592903021 is a prime.

It is a super-4 number, since 4×861338477⁴ (a number of 37 digits) contains 4444 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 (861338437) 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, 18724727 + ... + 18724772.

It is an arithmetic number, because the mean of its divisors is an integer number (224697000).

Almost surely, 2^861338477 is an apocalyptic number.

It is an amenable number.

861338477 is a deficient number, since it is larger than the sum of its proper divisors (37449523).

861338477 is a wasteful number, since it uses less digits than its factorization.

861338477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37449522.

The product of its digits is 677376, while the sum is 47.

The square root of 861338477 is about 29348.5685681602. The cubic root of 861338477 is about 951.4616381080.

The spelling of 861338477 in words is "eight hundred sixty-one million, three hundred thirty-eight thousand, four hundred seventy-seven".