1421340 has 24 divisors (see below), whose sum is σ = 3979920. Its totient is φ = 379008.

The previous prime is 1421339. The next prime is 1421351. The reversal of 1421340 is 431241.

1421340 = 418² + 419² + ... + 425².

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

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, 11785 + ... + 11904.

It is an arithmetic number, because the mean of its divisors is an integer number (165830).

2^1421340 is an apocalyptic number.

1421340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1421340 is an abundant number, since it is smaller than the sum of its proper divisors (2558580).

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

1421340 is a wasteful number, since it uses less digits than its factorization.

1421340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23701 (or 23699 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1421340 is about 1192.1996477101. The cubic root of 1421340 is about 112.4344309272.

Adding to 1421340 its reverse (431241), we get a palindrome (1852581).

Subtracting from 1421340 its reverse (431241), we obtain a palindrome (990099).

The spelling of 1421340 in words is "one million, four hundred twenty-one thousand, three hundred forty".