1427840 has 64 divisors (see below), whose sum is σ = 3598560. Its totient is φ = 540672.

The previous prime is 1427821. The next prime is 1427843. The reversal of 1427840 is 487241.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1427843) 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, 14672 + ... + 14768.

2^1427840 is an apocalyptic number.

1427840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1427840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1799280).

1427840 is an abundant number, since it is smaller than the sum of its proper divisors (2170720).

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

1427840 is an equidigital number, since it uses as much as digits as its factorization.

1427840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 1427840 is about 1194.9225916351. The cubic root of 1427840 is about 112.6055634658.

The spelling of 1427840 in words is "one million, four hundred twenty-seven thousand, eight hundred forty".