139406756 has 6 divisors (see below), whose sum is σ = 243961830. Its totient is φ = 69703376.

The previous prime is 139406753. The next prime is 139406759. The reversal of 139406756 is 657604931.

It is an interprime number because it is at equal distance from previous prime (139406753) and next prime (139406759).

It can be written as a sum of positive squares in only one way, i.e., 87796900 + 51609856 = 9370^2 + 7184^2 .

It is not an unprimeable number, because it can be changed into a prime (139406753) by changing a digit.

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, 17425841 + ... + 17425848.

It is an arithmetic number, because the mean of its divisors is an integer number (40660305).

Almost surely, 2^139406756 is an apocalyptic number.

It is an amenable number.

139406756 is a deficient number, since it is larger than the sum of its proper divisors (104555074).

139406756 is a wasteful number, since it uses less digits than its factorization.

139406756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34851693 (or 34851691 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 139406756 is about 11807.0638179016. The cubic root of 139406756 is about 518.5149394026.

The spelling of 139406756 in words is "one hundred thirty-nine million, four hundred six thousand, seven hundred fifty-six".