139034978 has 4 divisors (see below), whose sum is σ = 208552470. Its totient is φ = 69517488.

The previous prime is 139034971. The next prime is 139034981. The reversal of 139034978 is 879430931.

It is a happy number.

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., 93566929 + 45468049 = 9673^2 + 6743^2 .

It is not an unprimeable number, because it can be changed into a prime (139034971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34758743 + ... + 34758746.

Almost surely, 2^139034978 is an apocalyptic number.

139034978 is a deficient number, since it is larger than the sum of its proper divisors (69517492).

139034978 is an equidigital number, since it uses as much as digits as its factorization.

139034978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69517491.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 139034978 is about 11791.3094268618. The cubic root of 139034978 is about 518.0535938347.

It can be divided in two parts, 13903 and 4978, that added together give a palindrome (18881).

The spelling of 139034978 in words is "one hundred thirty-nine million, thirty-four thousand, nine hundred seventy-eight".