390078641 has 4 divisors (see below), whose sum is σ = 390362484. Its totient is φ = 389794800.

The previous prime is 390078631. The next prime is 390078649. The reversal of 390078641 is 146870093.

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 148742416 + 241336225 = 12196^2 + 15535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390078641 is a prime.

It is a super-2 number, since 2×390078641² = 304322692328813762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 390078595 and 390078604.

It is not an unprimeable number, because it can be changed into a prime (390078649) 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, 139850 + ... + 142611.

It is an arithmetic number, because the mean of its divisors is an integer number (97590621).

Almost surely, 2^390078641 is an apocalyptic number.

It is an amenable number.

390078641 is a deficient number, since it is larger than the sum of its proper divisors (283843).

390078641 is a wasteful number, since it uses less digits than its factorization.

390078641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283842.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 390078641 is about 19750.4086286841. The cubic root of 390078641 is about 730.6634620065.

The spelling of 390078641 in words is "three hundred ninety million, seventy-eight thousand, six hundred forty-one".