390249181 has 12 divisors (see below), whose sum is σ = 458376672. Its totient is φ = 331247448.

The previous prime is 390249179. The next prime is 390249191. The reversal of 390249181 is 181942093.

It is not a de Polignac number, because 390249181 - 2¹ = 390249179 is a prime.

It is a super-2 number, since 2×390249181² = 304588846542341522, 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 390249181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390249191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33615 + ... + 43708.

It is an arithmetic number, because the mean of its divisors is an integer number (38198056).

Almost surely, 2^390249181 is an apocalyptic number.

It is an amenable number.

390249181 is a deficient number, since it is larger than the sum of its proper divisors (68127491).

390249181 is a wasteful number, since it uses less digits than its factorization.

390249181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77440 (or 77433 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 390249181 is about 19754.7255359319. The cubic root of 390249181 is about 730.7699270274.

It can be divided in two parts, 39024 and 9181, that added together give a triangular number (48205 = T₃₁₀).

The spelling of 390249181 in words is "three hundred ninety million, two hundred forty-nine thousand, one hundred eighty-one".