390808471 has 4 divisors (see below), whose sum is σ = 394602832. Its totient is φ = 387014112.

The previous prime is 390808469. The next prime is 390808489. The reversal of 390808471 is 174808093.

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

It is a cyclic number.

It is not a de Polignac number, because 390808471 - 2¹ = 390808469 is a prime.

It is a super-3 number, since 3×390808471³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390808871) 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, 1897026 + ... + 1897231.

It is an arithmetic number, because the mean of its divisors is an integer number (98650708).

Almost surely, 2^390808471 is an apocalyptic number.

390808471 is a deficient number, since it is larger than the sum of its proper divisors (3794361).

390808471 is a wasteful number, since it uses less digits than its factorization.

390808471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3794360.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 390808471 is about 19768.8763211266. The cubic root of 390808471 is about 731.1188640976.

The spelling of 390808471 in words is "three hundred ninety million, eight hundred eight thousand, four hundred seventy-one".