861629439 has 16 divisors (see below), whose sum is σ = 1270450944. Its totient is φ = 515044800.

The previous prime is 861629437. The next prime is 861629449. The reversal of 861629439 is 934926168.

It is not a de Polignac number, because 861629439 - 2¹ = 861629437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861629437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176427 + ... + 181244.

It is an arithmetic number, because the mean of its divisors is an integer number (79403184).

Almost surely, 2^861629439 is an apocalyptic number.

861629439 is a deficient number, since it is larger than the sum of its proper divisors (408821505).

861629439 is a wasteful number, since it uses less digits than its factorization.

861629439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357758.

The product of its digits is 559872, while the sum is 48.

The square root of 861629439 is about 29353.5251545704. The cubic root of 861629439 is about 951.5687613130.

The spelling of 861629439 in words is "eight hundred sixty-one million, six hundred twenty-nine thousand, four hundred thirty-nine".