1398749 has 8 divisors (see below), whose sum is σ = 1542240. Its totient is φ = 1258000.

The previous prime is 1398737. The next prime is 1398763. The reversal of 1398749 is 9478931.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1398749 - 2⁸ = 1398493 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398769) 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, 482 + ... + 1740.

It is an arithmetic number, because the mean of its divisors is an integer number (192780).

2^1398749 is an apocalyptic number.

It is an amenable number.

1398749 is a deficient number, since it is larger than the sum of its proper divisors (143491).

1398749 is a wasteful number, since it uses less digits than its factorization.

1398749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371.

The product of its digits is 54432, while the sum is 41.

The square root of 1398749 is about 1182.6871944855. The cubic root of 1398749 is about 111.8355633291.

It can be divided in two parts, 139 and 8749, that added together give a palindrome (8888).

The spelling of 1398749 in words is "one million, three hundred ninety-eight thousand, seven hundred forty-nine".