1403989 has 4 divisors (see below), whose sum is σ = 1465056. Its totient is φ = 1342924.

The previous prime is 1403981. The next prime is 1404059. The reversal of 1403989 is 9893041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1403989 - 2³ = 1403981 is a prime.

It is a super-2 number, since 2×1403989² = 3942370224242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1403981) 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 3 ways as a sum of consecutive naturals, for example, 30499 + ... + 30544.

It is an arithmetic number, because the mean of its divisors is an integer number (366264).

2^1403989 is an apocalyptic number.

It is an amenable number.

1403989 is a deficient number, since it is larger than the sum of its proper divisors (61067).

1403989 is an equidigital number, since it uses as much as digits as its factorization.

1403989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61066.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 1403989 is about 1184.9004177567. The cubic root of 1403989 is about 111.9750422705.

The spelling of 1403989 in words is "one million, four hundred three thousand, nine hundred eighty-nine".