1897421 has 8 divisors (see below), whose sum is σ = 2021760. Its totient is φ = 1774528.

The previous prime is 1897409. The next prime is 1897429. The reversal of 1897421 is 1247981.

1897421 is nontrivially palindromic in base 4.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1897421 - 2¹⁴ = 1881037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897429) 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, 3830 + ... + 4296.

It is an arithmetic number, because the mean of its divisors is an integer number (252720).

2^1897421 is an apocalyptic number.

It is an amenable number.

1897421 is a deficient number, since it is larger than the sum of its proper divisors (124339).

1897421 is a wasteful number, since it uses less digits than its factorization.

1897421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723.

The product of its digits is 4032, while the sum is 32.

The square root of 1897421 is about 1377.4690559138. The cubic root of 1897421 is about 123.8001680753.

The spelling of 1897421 in words is "one million, eight hundred ninety-seven thousand, four hundred twenty-one".