1898397 has 20 divisors (see below), whose sum is σ = 2962080. Its totient is φ = 1209384.

The previous prime is 1898389. The next prime is 1898417. The reversal of 1898397 is 7938981.

It is not a de Polignac number, because 1898397 - 2³ = 1898389 is a prime.

It is a super-2 number, since 2×1898397² = 7207822339218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1898317) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1354 + ... + 2372.

It is an arithmetic number, because the mean of its divisors is an integer number (148104).

2^1898397 is an apocalyptic number.

It is an amenable number.

1898397 is a deficient number, since it is larger than the sum of its proper divisors (1063683).

1898397 is a wasteful number, since it uses less digits than its factorization.

1898397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054 (or 1045 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1898397 is about 1377.8232832987. The cubic root of 1898397 is about 123.8213913134.

The spelling of 1898397 in words is "one million, eight hundred ninety-eight thousand, three hundred ninety-seven".