905643742 has 8 divisors (see below), whose sum is σ = 1361401056. Its totient is φ = 451843392.

The previous prime is 905643719. The next prime is 905643743. The reversal of 905643742 is 247346509.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 905643695 and 905643704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (905643743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488083 + ... + 489934.

It is an arithmetic number, because the mean of its divisors is an integer number (170175132).

Almost surely, 2^905643742 is an apocalyptic number.

905643742 is a deficient number, since it is larger than the sum of its proper divisors (455757314).

905643742 is a wasteful number, since it uses less digits than its factorization.

905643742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978482.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 905643742 is about 30093.9153650701. The cubic root of 905643742 is about 967.5033189220.

The spelling of 905643742 in words is "nine hundred five million, six hundred forty-three thousand, seven hundred forty-two".