4209897 has 32 divisors (see below), whose sum is σ = 6435072. Its totient is φ = 2433024.

The previous prime is 4209889. The next prime is 4209899. The reversal of 4209897 is 7989024.

It is not a de Polignac number, because 4209897 - 2³ = 4209889 is a prime.

It is an Ulam number.

4209897 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4209899) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43353 + ... + 43449.

It is an arithmetic number, because the mean of its divisors is an integer number (201096).

Almost surely, 2^4209897 is an apocalyptic number.

It is an amenable number.

4209897 is a deficient number, since it is larger than the sum of its proper divisors (2225175).

4209897 is a wasteful number, since it uses less digits than its factorization.

4209897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 4209897 is about 2051.8033531506. The cubic root of 4209897 is about 161.4694961670.

It can be divided in two parts, 42098 and 97, that added together give a triangular number (42195 = T₂₉₀).

The spelling of 4209897 in words is "four million, two hundred nine thousand, eight hundred ninety-seven".