990478337 has 4 divisors (see below), whose sum is σ = 990546480. Its totient is φ = 990410196.

The previous prime is 990478331. The next prime is 990478367. The reversal of 990478337 is 733874099.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 733874099 = 7 ⋅104839157.

It is a cyclic number.

It is not a de Polignac number, because 990478337 - 2⁶ = 990478273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990478331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2543 + ... + 44580.

It is an arithmetic number, because the mean of its divisors is an integer number (247636620).

It is a Proth number, since it is equal to 30227 ⋅ 2¹⁵ + 1 and 30227 < 2¹⁵.

Almost surely, 2^990478337 is an apocalyptic number.

It is an amenable number.

990478337 is a deficient number, since it is larger than the sum of its proper divisors (68143).

990478337 is a wasteful number, since it uses less digits than its factorization.

990478337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68142.

The product of its (nonzero) digits is 1143072, while the sum is 50.

The square root of 990478337 is about 31471.8658010611. The cubic root of 990478337 is about 996.8159851425.

The spelling of 990478337 in words is "nine hundred ninety million, four hundred seventy-eight thousand, three hundred thirty-seven".