1253139747 has 8 divisors (see below), whose sum is σ = 1673644800. Its totient is φ = 834030600.

The previous prime is 1253139743. The next prime is 1253139757. The reversal of 1253139747 is 7479313521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1253139747 - 2² = 1253139743 is a prime.

It is a super-2 number, since 2×1253139747² = 3140718451022448018, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1253139699 and 1253139708.

It is not an unprimeable number, because it can be changed into a prime (1253139743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346879 + ... + 350472.

It is an arithmetic number, because the mean of its divisors is an integer number (209205600).

Almost surely, 2^1253139747 is an apocalyptic number.

1253139747 is a deficient number, since it is larger than the sum of its proper divisors (420505053).

1253139747 is an equidigital number, since it uses as much as digits as its factorization.

1253139747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697953.

The product of its digits is 158760, while the sum is 42.

The square root of 1253139747 is about 35399.7139395222. The cubic root of 1253139747 is about 1078.1185082373.

The spelling of 1253139747 in words is "one billion, two hundred fifty-three million, one hundred thirty-nine thousand, seven hundred forty-seven".