139021373 has 2 divisors, whose sum is σ = 139021374. Its totient is φ = 139021372.

The previous prime is 139021367. The next prime is 139021381. The reversal of 139021373 is 373120931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137428729 + 1592644 = 11723^2 + 1262^2 .

It is a cyclic number.

It is not a de Polignac number, because 139021373 - 2¹⁶ = 138955837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139021313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69510686 + 69510687.

It is an arithmetic number, because the mean of its divisors is an integer number (69510687).

Almost surely, 2^139021373 is an apocalyptic number.

It is an amenable number.

139021373 is a deficient number, since it is larger than the sum of its proper divisors (1).

139021373 is an equidigital number, since it uses as much as digits as its factorization.

139021373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 29.

The square root of 139021373 is about 11790.7325048107. The cubic root of 139021373 is about 518.0366955713.

The spelling of 139021373 in words is "one hundred thirty-nine million, twenty-one thousand, three hundred seventy-three".