391379650 has 48 divisors (see below), whose sum is σ = 777450240. Its totient is φ = 146260800.

The previous prime is 391379633. The next prime is 391379663. The reversal of 391379650 is 56973193.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 391379597 and 391379606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40597 + ... + 49303.

It is an arithmetic number, because the mean of its divisors is an integer number (16196880).

Almost surely, 2^391379650 is an apocalyptic number.

391379650 is a deficient number, since it is larger than the sum of its proper divisors (386070590).

391379650 is a wasteful number, since it uses less digits than its factorization.

391379650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8779 (or 8774 counting only the distinct ones).

The product of its (nonzero) digits is 153090, while the sum is 43.

The square root of 391379650 is about 19783.3174669973. The cubic root of 391379650 is about 731.4748751981.

The spelling of 391379650 in words is "three hundred ninety-one million, three hundred seventy-nine thousand, six hundred fifty".