391442629 has 8 divisors (see below), whose sum is σ = 414647640. Its totient is φ = 368257536.

The previous prime is 391442603. The next prime is 391442633. The reversal of 391442629 is 926244193.

It can be written as a sum of positive squares in 4 ways, for example, as 12945604 + 378497025 = 3598^2 + 19455^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 391442629 - 2⁷ = 391442501 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 391442591 and 391442600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391442329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59307 + ... + 65575.

It is an arithmetic number, because the mean of its divisors is an integer number (51830955).

Almost surely, 2^391442629 is an apocalyptic number.

It is an amenable number.

391442629 is a deficient number, since it is larger than the sum of its proper divisors (23205011).

391442629 is a wasteful number, since it uses less digits than its factorization.

391442629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9959.

The product of its digits is 93312, while the sum is 40.

The square root of 391442629 is about 19784.9091228643. The cubic root of 391442629 is about 731.5141082765.

The spelling of 391442629 in words is "three hundred ninety-one million, four hundred forty-two thousand, six hundred twenty-nine".