398140394 has 8 divisors (see below), whose sum is σ = 605391780. Its totient is φ = 196343136.

The previous prime is 398140363. The next prime is 398140411. The reversal of 398140394 is 493041893.

It can be written as a sum of positive squares in 2 ways, for example, as 341695225 + 56445169 = 18485^2 + 7513^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1363349 + ... + 1363640.

Almost surely, 2^398140394 is an apocalyptic number.

398140394 is a deficient number, since it is larger than the sum of its proper divisors (207251386).

398140394 is a wasteful number, since it uses less digits than its factorization.

398140394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2727064.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 398140394 is about 19953.4556906818. The cubic root of 398140394 is about 735.6627178700.

The spelling of 398140394 in words is "three hundred ninety-eight million, one hundred forty thousand, three hundred ninety-four".