390005081 has 4 divisors (see below), whose sum is σ = 390116352. Its totient is φ = 389893812.

The previous prime is 390005051. The next prime is 390005101. The reversal of 390005081 is 180500093.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390005081 is a prime.

It is a super-2 number, since 2×390005081² = 304207926411633122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 390005081.

It is not an unprimeable number, because it can be changed into a prime (390005051) 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, 50201 + ... + 57446.

It is an arithmetic number, because the mean of its divisors is an integer number (97529088).

Almost surely, 2^390005081 is an apocalyptic number.

It is an amenable number.

390005081 is a deficient number, since it is larger than the sum of its proper divisors (111271).

390005081 is a wasteful number, since it uses less digits than its factorization.

390005081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111270.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 390005081 is about 19748.5463009306. The cubic root of 390005081 is about 730.6175302571.

The spelling of 390005081 in words is "three hundred ninety million, five thousand, eighty-one".