1247906542 has 4 divisors (see below), whose sum is σ = 1871859816. Its totient is φ = 623953270.

The previous prime is 1247906533. The next prime is 1247906551. The reversal of 1247906542 is 2456097421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2456097421 = 383 ⋅6412787.

It is an interprime number because it is at equal distance from previous prime (1247906533) and next prime (1247906551).

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1247906495 and 1247906504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311976634 + ... + 311976637.

It is an arithmetic number, because the mean of its divisors is an integer number (467964954).

Almost surely, 2^1247906542 is an apocalyptic number.

1247906542 is a deficient number, since it is larger than the sum of its proper divisors (623953274).

1247906542 is an equidigital number, since it uses as much as digits as its factorization.

1247906542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623953273.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 1247906542 is about 35325.7206862082. The cubic root of 1247906542 is about 1076.6156465177.

The spelling of 1247906542 in words is "one billion, two hundred forty-seven million, nine hundred six thousand, five hundred forty-two".