390803645 has 4 divisors (see below), whose sum is σ = 468964380. Its totient is φ = 312642912.

The previous prime is 390803641. The next prime is 390803653. The reversal of 390803645 is 546308093.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 308248249 + 82555396 = 17557^2 + 9086^2 .

It is a cyclic number.

It is not a de Polignac number, because 390803645 - 2² = 390803641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 390803599 and 390803608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390803641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39080360 + ... + 39080369.

It is an arithmetic number, because the mean of its divisors is an integer number (117241095).

Almost surely, 2^390803645 is an apocalyptic number.

It is an amenable number.

390803645 is a deficient number, since it is larger than the sum of its proper divisors (78160735).

390803645 is an equidigital number, since it uses as much as digits as its factorization.

390803645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78160734.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 390803645 is about 19768.7542601956. The cubic root of 390803645 is about 731.1158546147.

The spelling of 390803645 in words is "three hundred ninety million, eight hundred three thousand, six hundred forty-five".