990421142 has 4 divisors (see below), whose sum is σ = 1485631716. Its totient is φ = 495210570.

The previous prime is 990421121. The next prime is 990421171. The reversal of 990421142 is 241124099.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 990421099 and 990421108.

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, 247605284 + ... + 247605287.

It is an arithmetic number, because the mean of its divisors is an integer number (371407929).

Almost surely, 2^990421142 is an apocalyptic number.

990421142 is a deficient number, since it is larger than the sum of its proper divisors (495210574).

990421142 is a wasteful number, since it uses less digits than its factorization.

990421142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495210573.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 990421142 is about 31470.9571192234. The cubic root of 990421142 is about 996.7967977844.

The spelling of 990421142 in words is "nine hundred ninety million, four hundred twenty-one thousand, one hundred forty-two".