1242040 has 16 divisors (see below), whose sum is σ = 2794680. Its totient is φ = 496800.

The previous prime is 1242029. The next prime is 1242061. The reversal of 1242040 is 402421.

It is a self number, because there is not a number n which added to its sum of digits gives 1242040.

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, 15486 + ... + 15565.

2^1242040 is an apocalyptic number.

1242040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242040 is an abundant number, since it is smaller than the sum of its proper divisors (1552640).

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

1242040 is a wasteful number, since it uses less digits than its factorization.

1242040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31062 (or 31058 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 1242040 is about 1114.4684831793. The cubic root of 1242040 is about 107.4925900788.

Adding to 1242040 its reverse (402421), we get a palindrome (1644461).

The spelling of 1242040 in words is "one million, two hundred forty-two thousand, forty".