390542 has 4 divisors (see below), whose sum is σ = 585816. Its totient is φ = 195270.

The previous prime is 390539. The next prime is 390553. The reversal of 390542 is 245093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 245093 = 137 ⋅1789.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97634 + ... + 97637.

It is an arithmetic number, because the mean of its divisors is an integer number (146454).

2³⁹⁰⁵⁴² is an apocalyptic number.

390542 is a deficient number, since it is larger than the sum of its proper divisors (195274).

390542 is a wasteful number, since it uses less digits than its factorization.

390542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195273.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 390542 is about 624.9335964725. The cubic root of 390542 is about 73.0952656278.

The spelling of 390542 in words is "three hundred ninety thousand, five hundred forty-two".