990142 has 4 divisors (see below), whose sum is σ = 1485216. Its totient is φ = 495070.

The previous prime is 990137. The next prime is 990151. The reversal of 990142 is 241099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 241099 = 353 ⋅683.

It is a plaindrome in base 13.

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, 247534 + ... + 247537.

It is an arithmetic number, because the mean of its divisors is an integer number (371304).

2⁹⁹⁰¹⁴² is an apocalyptic number.

990142 is a deficient number, since it is larger than the sum of its proper divisors (495074).

990142 is a wasteful number, since it uses less digits than its factorization.

990142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495073.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 990142 is about 995.0587922329. The cubic root of 990142 is about 99.6703142677.

The spelling of 990142 in words is "nine hundred ninety thousand, one hundred forty-two".