697734139 has 4 divisors (see below), whose sum is σ = 697939200. Its totient is φ = 697529080.

The previous prime is 697734109. The next prime is 697734157. The reversal of 697734139 is 931437796.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 697734139 - 2⁹ = 697733627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 697734092 and 697734101.

It is not an unprimeable number, because it can be changed into a prime (697734109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97339 + ... + 104260.

It is an arithmetic number, because the mean of its divisors is an integer number (174484800).

Almost surely, 2^697734139 is an apocalyptic number.

697734139 is a deficient number, since it is larger than the sum of its proper divisors (205061).

697734139 is a wasteful number, since it uses less digits than its factorization.

697734139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205060.

The product of its digits is 857304, while the sum is 49.

The square root of 697734139 is about 26414.6576544160. The cubic root of 697734139 is about 886.9449342528.

The spelling of 697734139 in words is "six hundred ninety-seven million, seven hundred thirty-four thousand, one hundred thirty-nine".