990333977 has 8 divisors (see below), whose sum is σ = 1033712064. Its totient is φ = 946982608.

The previous prime is 990333959. The next prime is 990333983. The reversal of 990333977 is 779333099.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 990333977 - 2¹⁸ = 990071833 is a prime.

It is a super-2 number, since 2×990333977² = 1961522772001273058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990353977) 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, 122183 + ... + 130035.

It is an arithmetic number, because the mean of its divisors is an integer number (129214008).

Almost surely, 2^990333977 is an apocalyptic number.

It is an amenable number.

990333977 is a deficient number, since it is larger than the sum of its proper divisors (43378087).

990333977 is a wasteful number, since it uses less digits than its factorization.

990333977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13359.

The product of its (nonzero) digits is 964467, while the sum is 50.

The square root of 990333977 is about 31469.5722404992. The cubic root of 990333977 is about 996.7675548902.

The spelling of 990333977 in words is "nine hundred ninety million, three hundred thirty-three thousand, nine hundred seventy-seven".