139945394 has 8 divisors (see below), whose sum is σ = 222266268. Its totient is φ = 65856640.

The previous prime is 139945373. The next prime is 139945397. The reversal of 139945394 is 493549931.

It is a happy number.

139945394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 138415225 + 1530169 = 11765^2 + 1237^2 .

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

It is not an unprimeable number, because it can be changed into a prime (139945397) 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, 2057987 + ... + 2058054.

Almost surely, 2^139945394 is an apocalyptic number.

139945394 is a deficient number, since it is larger than the sum of its proper divisors (82320874).

139945394 is a wasteful number, since it uses less digits than its factorization.

139945394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4116060.

The product of its digits is 524880, while the sum is 47.

The square root of 139945394 is about 11829.8518164853. The cubic root of 139945394 is about 519.1818915648.

The spelling of 139945394 in words is "one hundred thirty-nine million, nine hundred forty-five thousand, three hundred ninety-four".