1247920143 has 4 divisors (see below), whose sum is σ = 1663893528. Its totient is φ = 831946760.

The previous prime is 1247920129. The next prime is 1247920153. The reversal of 1247920143 is 3410297421.

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 1247920143 - 2¹⁴ = 1247903759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247920153) 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, 207986688 + ... + 207986693.

It is an arithmetic number, because the mean of its divisors is an integer number (415973382).

Almost surely, 2^1247920143 is an apocalyptic number.

1247920143 is a deficient number, since it is larger than the sum of its proper divisors (415973385).

1247920143 is an equidigital number, since it uses as much as digits as its factorization.

1247920143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415973384.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 1247920143 is about 35325.9131941412. The cubic root of 1247920143 is about 1076.6195578673.

The spelling of 1247920143 in words is "one billion, two hundred forty-seven million, nine hundred twenty thousand, one hundred forty-three".