1242740 has 12 divisors (see below), whose sum is σ = 2609796. Its totient is φ = 497088.

The previous prime is 1242739. The next prime is 1242757. The reversal of 1242740 is 472421.

It can be written as a sum of positive squares in 2 ways, for example, as 763876 + 478864 = 874^2 + 692^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 62137 = 1242740 / (1 + 2 + 4 + 2 + 7 + 4 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31049 + ... + 31088.

It is an arithmetic number, because the mean of its divisors is an integer number (217483).

2^1242740 is an apocalyptic number.

1242740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242740 is an abundant number, since it is smaller than the sum of its proper divisors (1367056).

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

1242740 is a wasteful number, since it uses less digits than its factorization.

1242740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62146 (or 62144 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 1242740 is about 1114.7824899952. The cubic root of 1242740 is about 107.5127801644.

The spelling of 1242740 in words is "one million, two hundred forty-two thousand, seven hundred forty".