139534973 has 2 divisors, whose sum is σ = 139534974. Its totient is φ = 139534972.

The previous prime is 139534939. The next prime is 139534981. The reversal of 139534973 is 379435931.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74684164 + 64850809 = 8642^2 + 8053^2 .

It is a cyclic number.

It is not a de Polignac number, because 139534973 - 2¹⁶ = 139469437 is a prime.

It is a super-2 number, since 2×139534973² = 38940017380221458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139534273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69767486 + 69767487.

It is an arithmetic number, because the mean of its divisors is an integer number (69767487).

Almost surely, 2^139534973 is an apocalyptic number.

It is an amenable number.

139534973 is a deficient number, since it is larger than the sum of its proper divisors (1).

139534973 is an equidigital number, since it uses as much as digits as its factorization.

139534973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 306180, while the sum is 44.

The square root of 139534973 is about 11812.4922433837. The cubic root of 139534973 is about 518.6738558001.

The spelling of 139534973 in words is "one hundred thirty-nine million, five hundred thirty-four thousand, nine hundred seventy-three".