990693236 has 24 divisors (see below), whose sum is σ = 1878983400. Its totient is φ = 454326912.

The previous prime is 990693233. The next prime is 990693247. The reversal of 990693236 is 632396099.

It can be written as a sum of positive squares in 4 ways, for example, as 10627600 + 980065636 = 3260^2 + 31306^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990693233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52511 + ... + 68838.

It is an arithmetic number, because the mean of its divisors is an integer number (78290975).

It is the magic constant of a 1256 × 1256 magic square.

Almost surely, 2^990693236 is an apocalyptic number.

It is an amenable number.

990693236 is a deficient number, since it is larger than the sum of its proper divisors (888290164).

990693236 is a wasteful number, since it uses less digits than its factorization.

990693236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121523 (or 121521 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 47.

The square root of 990693236 is about 31475.2797604723. The cubic root of 990693236 is about 996.8880712784. Note that the first 3 decimals are identical.

The spelling of 990693236 in words is "nine hundred ninety million, six hundred ninety-three thousand, two hundred thirty-six".