139857293 has 2 divisors, whose sum is σ = 139857294. Its totient is φ = 139857292.

The previous prime is 139857287. The next prime is 139857307. The reversal of 139857293 is 392758931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118309129 + 21548164 = 10877^2 + 4642^2 .

It is a cyclic number.

It is not a de Polignac number, because 139857293 - 2²⁰ = 138808717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139857253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69928646 + 69928647.

It is an arithmetic number, because the mean of its divisors is an integer number (69928647).

Almost surely, 2^139857293 is an apocalyptic number.

It is an amenable number.

139857293 is a deficient number, since it is larger than the sum of its proper divisors (1).

139857293 is an equidigital number, since it uses as much as digits as its factorization.

139857293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 47.

The square root of 139857293 is about 11826.1275572353. The cubic root of 139857293 is about 519.0729203813.

The spelling of 139857293 in words is "one hundred thirty-nine million, eight hundred fifty-seven thousand, two hundred ninety-three".