690207139 has 4 divisors (see below), whose sum is σ = 708861424. Its totient is φ = 671552856.

The previous prime is 690207137. The next prime is 690207149. The reversal of 690207139 is 931702096.

690207139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 690207139 - 2¹ = 690207137 is a prime.

It is a super-4 number, since 4×690207139⁴ (a number of 36 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 18654247 = 690207139 / (6 + 9 + 0 + 2 + 0 + 7 + 1 + 3 + 9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 690207098 and 690207107.

It is not an unprimeable number, because it can be changed into a prime (690207137) 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, 9327087 + ... + 9327160.

It is an arithmetic number, because the mean of its divisors is an integer number (177215356).

Almost surely, 2^690207139 is an apocalyptic number.

690207139 is a deficient number, since it is larger than the sum of its proper divisors (18654285).

690207139 is a wasteful number, since it uses less digits than its factorization.

690207139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18654284.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 690207139 is about 26271.7936007422. The cubic root of 690207139 is about 883.7440082899.

The spelling of 690207139 in words is "six hundred ninety million, two hundred seven thousand, one hundred thirty-nine".