1242749540 has 12 divisors (see below), whose sum is σ = 2609774076. Its totient is φ = 497099808.

The previous prime is 1242749531. The next prime is 1242749569. The reversal of 1242749540 is 459472421.

It can be written as a sum of positive squares in 2 ways, for example, as 220284964 + 1022464576 = 14842^2 + 31976^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1242749494 and 1242749503.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 31068719 + ... + 31068758.

It is an arithmetic number, because the mean of its divisors is an integer number (217481173).

Almost surely, 2^1242749540 is an apocalyptic number.

1242749540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242749540 is an abundant number, since it is smaller than the sum of its proper divisors (1367024536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1242749540 is a wasteful number, since it uses less digits than its factorization.

1242749540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62137486 (or 62137484 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 1242749540 is about 35252.6529498136. The cubic root of 1242749540 is about 1075.1305527401.

The spelling of 1242749540 in words is "one billion, two hundred forty-two million, seven hundred forty-nine thousand, five hundred forty".