158778394 has 4 divisors (see below), whose sum is σ = 238167594. Its totient is φ = 79389196.

The previous prime is 158778371. The next prime is 158778401. The reversal of 158778394 is 493877851.

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., 84180625 + 74597769 = 9175^2 + 8637^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39694597 + ... + 39694600.

Almost surely, 2^158778394 is an apocalyptic number.

158778394 is a deficient number, since it is larger than the sum of its proper divisors (79389200).

158778394 is an equidigital number, since it uses as much as digits as its factorization.

158778394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79389199.

The product of its digits is 1693440, while the sum is 52.

The square root of 158778394 is about 12600.7298994939. The cubic root of 158778394 is about 541.4983466700.

The spelling of 158778394 in words is "one hundred fifty-eight million, seven hundred seventy-eight thousand, three hundred ninety-four".