1409989 has 8 divisors (see below), whose sum is σ = 1634688. Its totient is φ = 1191120.

The previous prime is 1409977. The next prime is 1409999. The reversal of 1409989 is 9899041.

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

It is not a de Polignac number, because 1409989 - 2⁵ = 1409957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1409999) 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, 922 + ... + 1915.

It is an arithmetic number, because the mean of its divisors is an integer number (204336).

2^1409989 is an apocalyptic number.

It is an amenable number.

1409989 is a deficient number, since it is larger than the sum of its proper divisors (224699).

1409989 is an equidigital number, since it uses as much as digits as its factorization.

1409989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 1409989 is about 1187.4295768592. The cubic root of 1409989 is about 112.1343254416.

The spelling of 1409989 in words is "one million, four hundred nine thousand, nine hundred eighty-nine".