1398609 has 12 divisors (see below), whose sum is σ = 2126800. Its totient is φ = 883224.

The previous prime is 1398599. The next prime is 1398611. The reversal of 1398609 is 9068931.

It is not a de Polignac number, because 1398609 - 2⁵ = 1398577 is a prime.

It is a super-2 number, since 2×1398609² = 3912214269762, which contains 22 as substring.

It is a Duffinian number.

1398609 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1398619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3919 + ... + 4260.

2^1398609 is an apocalyptic number.

1398609 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1398609 is a deficient number, since it is larger than the sum of its proper divisors (728191).

1398609 is a wasteful number, since it uses less digits than its factorization.

1398609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8204 (or 8201 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1398609 is about 1182.6280057567. The cubic root of 1398609 is about 111.8318320184.

Subtracting from 1398609 its product of nonzero digits (11664), we obtain a triangular number (1386945 = T₁₆₆₅).

The spelling of 1398609 in words is "one million, three hundred ninety-eight thousand, six hundred nine".