1240428 has 24 divisors (see below), whose sum is σ = 3308032. Its totient is φ = 354384.

The previous prime is 1240423. The next prime is 1240483. The reversal of 1240428 is 8240421.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1240423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7300 + ... + 7467.

2^1240428 is an apocalyptic number.

It is an amenable number.

1240428 is an abundant number, since it is smaller than the sum of its proper divisors (2067604).

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

1240428 is a wasteful number, since it uses less digits than its factorization.

1240428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14781 (or 14779 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 1240428 is about 1113.7450336590. The cubic root of 1240428 is about 107.4460663294.

Adding to 1240428 its reverse (8240421), we get a palindrome (9480849).

The spelling of 1240428 in words is "one million, two hundred forty thousand, four hundred twenty-eight".