1242736649 has 32 divisors (see below), whose sum is σ = 1642708992. Its totient is φ = 911736000.

The previous prime is 1242736639. The next prime is 1242736657. The reversal of 1242736649 is 9466372421.

It is a de Polignac number, because none of the positive numbers 2^k-1242736649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1242736639) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81284 + ... + 95354.

It is an arithmetic number, because the mean of its divisors is an integer number (51334656).

Almost surely, 2^1242736649 is an apocalyptic number.

It is an amenable number.

1242736649 is a deficient number, since it is larger than the sum of its proper divisors (399972343).

1242736649 is a wasteful number, since it uses less digits than its factorization.

1242736649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14157.

The product of its digits is 435456, while the sum is 44.

The square root of 1242736649 is about 35252.4701120361. The cubic root of 1242736649 is about 1075.1268352960.

The spelling of 1242736649 in words is "one billion, two hundred forty-two million, seven hundred thirty-six thousand, six hundred forty-nine".