1242639499 has 8 divisors (see below), whose sum is σ = 1272130112. Its totient is φ = 1213175880.

The previous prime is 1242639491. The next prime is 1242639509. The reversal of 1242639499 is 9949362421.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1242639499 - 2³ = 1242639491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242639491) 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, 109984 + ... + 120754.

It is an arithmetic number, because the mean of its divisors is an integer number (159016264).

Almost surely, 2^1242639499 is an apocalyptic number.

1242639499 is a deficient number, since it is larger than the sum of its proper divisors (29490613).

1242639499 is a wasteful number, since it uses less digits than its factorization.

1242639499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13497.

The product of its digits is 839808, while the sum is 49.

The square root of 1242639499 is about 35251.0921674776. The cubic root of 1242639499 is about 1075.0988188228.

The spelling of 1242639499 in words is "one billion, two hundred forty-two million, six hundred thirty-nine thousand, four hundred ninety-nine".