3994331121 has 72 divisors (see below), whose sum is σ = 6592884480. Its totient is φ = 2326104000.

The previous prime is 3994331111. The next prime is 3994331123. The reversal of 3994331121 is 1211334993.

It is not a de Polignac number, because 3994331121 - 2²² = 3990136817 is a prime.

It is a super-2 number, since 2×3994331121² = 31909362208378233282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3994331123) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6042531 + ... + 6043191.

It is an arithmetic number, because the mean of its divisors is an integer number (91567840).

Almost surely, 2^3994331121 is an apocalyptic number.

3994331121 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3994331121 is a deficient number, since it is larger than the sum of its proper divisors (2598553359).

3994331121 is a wasteful number, since it uses less digits than its factorization.

3994331121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899 (or 885 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 3994331121 is about 63200.7208898759. The cubic root of 3994331121 is about 1586.6507987246.

The spelling of 3994331121 in words is "three billion, nine hundred ninety-four million, three hundred thirty-one thousand, one hundred twenty-one".