990349642 has 8 divisors (see below), whose sum is σ = 1500232932. Its totient is φ = 490272000.

The previous prime is 990349639. The next prime is 990349691. The reversal of 990349642 is 246943099.

It can be written as a sum of positive squares in 2 ways, for example, as 845123041 + 145226601 = 29071^2 + 12051^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 990349592 and 990349601.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2451159 + ... + 2451562.

Almost surely, 2^990349642 is an apocalyptic number.

990349642 is a deficient number, since it is larger than the sum of its proper divisors (509883290).

990349642 is a wasteful number, since it uses less digits than its factorization.

990349642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4902824.

The product of its (nonzero) digits is 419904, while the sum is 46.

The square root of 990349642 is about 31469.8211307278. The cubic root of 990349642 is about 996.7728104511.

The spelling of 990349642 in words is "nine hundred ninety million, three hundred forty-nine thousand, six hundred forty-two".