394978097 has 4 divisors (see below), whose sum is σ = 395237616. Its totient is φ = 394718580.

The previous prime is 394978081. The next prime is 394978109. The reversal of 394978097 is 790879493.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 790879493 = 157 ⋅5037449.

It is a cyclic number.

It is not a de Polignac number, because 394978097 - 2⁴ = 394978081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394978007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127463 + ... + 130524.

It is an arithmetic number, because the mean of its divisors is an integer number (98809404).

Almost surely, 2^394978097 is an apocalyptic number.

It is an amenable number.

394978097 is a deficient number, since it is larger than the sum of its proper divisors (259519).

394978097 is a wasteful number, since it uses less digits than its factorization.

394978097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259518.

The product of its (nonzero) digits is 3429216, while the sum is 56.

The square root of 394978097 is about 19874.0558769467. The cubic root of 394978097 is about 733.7098300648.

The spelling of 394978097 in words is "three hundred ninety-four million, nine hundred seventy-eight thousand, ninety-seven".