1420640 has 48 divisors (see below), whose sum is σ = 3619728. Its totient is φ = 523776.

The previous prime is 1420633. The next prime is 1420651. The reversal of 1420640 is 460241.

1420640 = T₄₅ + T₄₆ + ... + T₂₀₄.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1739 + ... + 2421.

It is an arithmetic number, because the mean of its divisors is an integer number (75411).

2^1420640 is an apocalyptic number.

1420640 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 1420640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1809864).

1420640 is an abundant number, since it is smaller than the sum of its proper divisors (2199088).

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

1420640 is a wasteful number, since it uses less digits than its factorization.

1420640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711 (or 703 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1420640 is about 1191.9060365650. The cubic root of 1420640 is about 112.4159701729.

Adding to 1420640 its reverse (460241), we get a palindrome (1880881).

The spelling of 1420640 in words is "one million, four hundred twenty thousand, six hundred forty".