1242549 has 36 divisors (see below), whose sum is σ = 2268448. Its totient is φ = 641520.

The previous prime is 1242517. The next prime is 1242569. The reversal of 1242549 is 9452421.

1242549 = T₄₂ + T₄₃ + ... + T₁₉₅.

It is not a de Polignac number, because 1242549 - 2⁵ = 1242517 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

1242549 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7542 + ... + 7704.

2^1242549 is an apocalyptic number.

It is an amenable number.

1242549 is a deficient number, since it is larger than the sum of its proper divisors (1025899).

1242549 is a wasteful number, since it uses less digits than its factorization.

1242549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 184 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 1242549 is about 1114.6968197676. The cubic root of 1242549 is about 107.5072719076.

The spelling of 1242549 in words is "one million, two hundred forty-two thousand, five hundred forty-nine".