1897420 has 24 divisors (see below), whose sum is σ = 4554144. Its totient is φ = 650496.

The previous prime is 1897409. The next prime is 1897429. The reversal of 1897420 is 247981.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (1897429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6637 + ... + 6916.

It is an arithmetic number, because the mean of its divisors is an integer number (189756).

2^1897420 is an apocalyptic number.

1897420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1897420 is an abundant number, since it is smaller than the sum of its proper divisors (2656724).

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

1897420 is a wasteful number, since it uses less digits than its factorization.

1897420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13569 (or 13567 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 1897420 is about 1377.4686929292. The cubic root of 1897420 is about 123.8001463265.

The spelling of 1897420 in words is "one million, eight hundred ninety-seven thousand, four hundred twenty".