398893394 has 4 divisors (see below), whose sum is σ = 598340094. Its totient is φ = 199446696.

The previous prime is 398893381. The next prime is 398893403. The reversal of 398893394 is 493398893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 493398893 = 13 ⋅37953761.

It can be written as a sum of positive squares in only one way, i.e., 382789225 + 16104169 = 19565^2 + 4013^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99723347 + ... + 99723350.

Almost surely, 2^398893394 is an apocalyptic number.

398893394 is a deficient number, since it is larger than the sum of its proper divisors (199446700).

398893394 is a wasteful number, since it uses less digits than its factorization.

398893394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199446699.

The product of its digits is 5038848, while the sum is 56.

The square root of 398893394 is about 19972.3156894738. The cubic root of 398893394 is about 736.1262102893.

The spelling of 398893394 in words is "three hundred ninety-eight million, eight hundred ninety-three thousand, three hundred ninety-four".