390378563 has 8 divisors (see below), whose sum is σ = 407846400. Its totient is φ = 372952008.

The previous prime is 390378551. The next prime is 390378619. The reversal of 390378563 is 365873093.

It is a Cunningham number, because it is equal to 19758²-1.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390378563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390378533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9878 + ... + 29636.

It is an arithmetic number, because the mean of its divisors is an integer number (50980800).

Almost surely, 2^390378563 is an apocalyptic number.

390378563 is a deficient number, since it is larger than the sum of its proper divisors (17467837).

390378563 is a wasteful number, since it uses less digits than its factorization.

390378563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20641.

The product of its (nonzero) digits is 408240, while the sum is 44.

The square root of 390378563 is about 19757.9999746938. Note that the first 4 decimals coincide. The cubic root of 390378563 is about 730.8506771673.

The spelling of 390378563 in words is "three hundred ninety million, three hundred seventy-eight thousand, five hundred sixty-three".