1230139747 has 4 divisors (see below), whose sum is σ = 1230432840. Its totient is φ = 1229846656.

The previous prime is 1230139721. The next prime is 1230139759. The reversal of 1230139747 is 7479310321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7479310321 = 7 ⋅1068472903.

It is a cyclic number.

It is not a de Polignac number, because 1230139747 - 2¹⁵ = 1230106979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1230139147) 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, 140158 + ... + 148675.

It is an arithmetic number, because the mean of its divisors is an integer number (307608210).

Almost surely, 2^1230139747 is an apocalyptic number.

1230139747 is a deficient number, since it is larger than the sum of its proper divisors (293093).

1230139747 is an equidigital number, since it uses as much as digits as its factorization.

1230139747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293092.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 1230139747 is about 35073.3481008016. The cubic root of 1230139747 is about 1071.4818455804.

The spelling of 1230139747 in words is "one billion, two hundred thirty million, one hundred thirty-nine thousand, seven hundred forty-seven".