990661438 has 24 divisors (see below), whose sum is σ = 1631794896. Its totient is φ = 450777600.

The previous prime is 990661423. The next prime is 990661439. The reversal of 990661438 is 834166099.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990661439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3358 + ... + 44638.

It is an arithmetic number, because the mean of its divisors is an integer number (67991454).

Almost surely, 2^990661438 is an apocalyptic number.

990661438 is a deficient number, since it is larger than the sum of its proper divisors (641133458).

990661438 is a wasteful number, since it uses less digits than its factorization.

990661438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41380 (or 41367 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 990661438 is about 31474.7746298524. The cubic root of 990661438 is about 996.8774055530.

The spelling of 990661438 in words is "nine hundred ninety million, six hundred sixty-one thousand, four hundred thirty-eight".