394242993619 has 2 divisors, whose sum is σ = 394242993620. Its totient is φ = 394242993618.

The previous prime is 394242993581. The next prime is 394242993667. The reversal of 394242993619 is 916399242493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394242993619 - 2¹⁷ = 394242862547 is a prime.

It is a super-2 number, since 2×394242993619² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (394242913619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197121496809 + 197121496810.

It is an arithmetic number, because the mean of its divisors is an integer number (197121496810).

Almost surely, 2^394242993619 is an apocalyptic number.

394242993619 is a deficient number, since it is larger than the sum of its proper divisors (1).

394242993619 is an equidigital number, since it uses as much as digits as its factorization.

394242993619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22674816, while the sum is 61.

The spelling of 394242993619 in words is "three hundred ninety-four billion, two hundred forty-two million, nine hundred ninety-three thousand, six hundred nineteen".