1247407139 has 16 divisors (see below), whose sum is σ = 1441186560. Its totient is φ = 1068497760.

The previous prime is 1247407127. The next prime is 1247407151. The reversal of 1247407139 is 9317047421.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1247407127) and next prime (1247407151).

It is not a de Polignac number, because 1247407139 - 2⁴ = 1247407123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1247407169) 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, 19844 + ... + 53745.

It is an arithmetic number, because the mean of its divisors is an integer number (90074160).

Almost surely, 2^1247407139 is an apocalyptic number.

1247407139 is a deficient number, since it is larger than the sum of its proper divisors (193779421).

1247407139 is a wasteful number, since it uses less digits than its factorization.

1247407139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73690.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 1247407139 is about 35318.6514323523. The cubic root of 1247407139 is about 1076.4720094731.

The spelling of 1247407139 in words is "one billion, two hundred forty-seven million, four hundred seven thousand, one hundred thirty-nine".