1424840 has 32 divisors (see below), whose sum is σ = 3240000. Its totient is φ = 563904.

The previous prime is 1424837. The next prime is 1424849. The reversal of 1424840 is 484241.

1424840 = T₄₁₄ + T₄₁₅ + ... + T₄₂₉.

It is not an unprimeable number, because it can be changed into a prime (1424849) 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, 7061 + ... + 7259.

It is an arithmetic number, because the mean of its divisors is an integer number (101250).

2^1424840 is an apocalyptic number.

1424840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1424840 is an abundant number, since it is smaller than the sum of its proper divisors (1815160).

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

1424840 is a wasteful number, since it uses less digits than its factorization.

1424840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 1424840 is about 1193.6666201247. Note that the first 4 decimals coincide. The cubic root of 1424840 is about 112.5266438951.

The spelling of 1424840 in words is "one million, four hundred twenty-four thousand, eight hundred forty".