1421904 has 40 divisors (see below), whose sum is σ = 4008672. Its totient is φ = 430720.

The previous prime is 1421867. The next prime is 1421909. The reversal of 1421904 is 4091241.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421909) 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, 819 + ... + 1874.

2^1421904 is an apocalyptic number.

It is an amenable number.

1421904 is an abundant number, since it is smaller than the sum of its proper divisors (2586768).

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

1421904 is a wasteful number, since it uses less digits than its factorization.

1421904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2715 (or 2709 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1421904 is about 1192.4361618133. The cubic root of 1421904 is about 112.4493006120.

The spelling of 1421904 in words is "one million, four hundred twenty-one thousand, nine hundred four".