993211387 has 32 divisors (see below), whose sum is σ = 1216077824. Its totient is φ = 793152000.

The previous prime is 993211367. The next prime is 993211391. The reversal of 993211387 is 783112399.

It is a cyclic number.

It is not a de Polignac number, because 993211387 - 2⁷ = 993211259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (993211327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 826387 + ... + 827587.

It is an arithmetic number, because the mean of its divisors is an integer number (38002432).

Almost surely, 2^993211387 is an apocalyptic number.

993211387 is a deficient number, since it is larger than the sum of its proper divisors (222866437).

993211387 is a wasteful number, since it uses less digits than its factorization.

993211387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379.

The product of its digits is 81648, while the sum is 43.

The square root of 993211387 is about 31515.2564165358. The cubic root of 993211387 is about 997.7319890150.

The spelling of 993211387 in words is "nine hundred ninety-three million, two hundred eleven thousand, three hundred eighty-seven".