1390691239 has 16 divisors (see below), whose sum is σ = 1688275008. Its totient is φ = 1118287872.

The previous prime is 1390691227. The next prime is 1390691243. The reversal of 1390691239 is 9321960931.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1390691239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1390691195 and 1390691204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390691219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18579 + ... + 55915.

It is an arithmetic number, because the mean of its divisors is an integer number (105517188).

Almost surely, 2^1390691239 is an apocalyptic number.

1390691239 is a deficient number, since it is larger than the sum of its proper divisors (297583769).

1390691239 is a wasteful number, since it uses less digits than its factorization.

1390691239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37674.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 1390691239 is about 37291.9728493948. The cubic root of 1390691239 is about 1116.2039958770.

The spelling of 1390691239 in words is "one billion, three hundred ninety million, six hundred ninety-one thousand, two hundred thirty-nine".