921378606 has 16 divisors (see below), whose sum is σ = 1877526864. Its totient is φ = 301331264.

The previous prime is 921378589. The next prime is 921378607. The reversal of 921378606 is 606873129.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921378607) 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 7 ways as a sum of consecutive naturals, for example, 1448391 + ... + 1449026.

It is an arithmetic number, because the mean of its divisors is an integer number (117345429).

Almost surely, 2^921378606 is an apocalyptic number.

921378606 is an abundant number, since it is smaller than the sum of its proper divisors (956148258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

921378606 is a wasteful number, since it uses less digits than its factorization.

921378606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2897475.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 921378606 is about 30354.2189159926. The cubic root of 921378606 is about 973.0743869497.

The spelling of 921378606 in words is "nine hundred twenty-one million, three hundred seventy-eight thousand, six hundred six".