990542 has 8 divisors (see below), whose sum is σ = 1698096. Its totient is φ = 424512.

The previous prime is 990529. The next prime is 990547. The reversal of 990542 is 245099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990547) by changing a digit.

990542 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35363 + ... + 35390.

It is an arithmetic number, because the mean of its divisors is an integer number (212262).

2⁹⁹⁰⁵⁴² is an apocalyptic number.

990542 is a deficient number, since it is larger than the sum of its proper divisors (707554).

990542 is a wasteful number, since it uses less digits than its factorization.

990542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70762.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 990542 is about 995.2597650865. The cubic root of 990542 is about 99.6837341469.

The spelling of 990542 in words is "nine hundred ninety thousand, five hundred forty-two".