390551 has 4 divisors (see below), whose sum is σ = 446352. Its totient is φ = 334752.

The previous prime is 390539. The next prime is 390553. The reversal of 390551 is 155093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155093 = 31 ⋅5003.

It is a cyclic number.

It is not a de Polignac number, because 390551 - 2⁶ = 390487 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27890 + ... + 27903.

It is an arithmetic number, because the mean of its divisors is an integer number (111588).

2³⁹⁰⁵⁵¹ is an apocalyptic number.

390551 is a deficient number, since it is larger than the sum of its proper divisors (55801).

390551 is an equidigital number, since it uses as much as digits as its factorization.

390551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55800.

The product of its (nonzero) digits is 675, while the sum is 23.

The square root of 390551 is about 624.9407971960. The cubic root of 390551 is about 73.0958271145.

The spelling of 390551 in words is "three hundred ninety thousand, five hundred fifty-one".