1242149686 has 16 divisors (see below), whose sum is σ = 1933417728. Its totient is φ = 598084200.

The previous prime is 1242149683. The next prime is 1242149723. The reversal of 1242149686 is 6869412421.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242149683) 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, 95610 + ... + 107821.

It is an arithmetic number, because the mean of its divisors is an integer number (120838608).

Almost surely, 2^1242149686 is an apocalyptic number.

1242149686 is a deficient number, since it is larger than the sum of its proper divisors (691268042).

1242149686 is a wasteful number, since it uses less digits than its factorization.

1242149686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203547.

The product of its digits is 165888, while the sum is 43.

The square root of 1242149686 is about 35244.1439958470. The cubic root of 1242149686 is about 1074.9575425092.

The spelling of 1242149686 in words is "one billion, two hundred forty-two million, one hundred forty-nine thousand, six hundred eighty-six".