3998890394 has 4 divisors (see below), whose sum is σ = 5998335594. Its totient is φ = 1999445196.

The previous prime is 3998890369. The next prime is 3998890429. The reversal of 3998890394 is 4930988993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3967362169 + 31528225 = 62987^2 + 5615^2 .

It is a super-2 number, since 2×3998890394² = 31982248766450950472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999722597 + ... + 999722600.

Almost surely, 2^3998890394 is an apocalyptic number.

3998890394 is a deficient number, since it is larger than the sum of its proper divisors (1999445200).

3998890394 is a wasteful number, since it uses less digits than its factorization.

3998890394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999445199.

The product of its (nonzero) digits is 15116544, while the sum is 62.

The square root of 3998890394 is about 63236.7803892640. The cubic root of 3998890394 is about 1587.2542559159.

The spelling of 3998890394 in words is "three billion, nine hundred ninety-eight million, eight hundred ninety thousand, three hundred ninety-four".