1406989 has 4 divisors (see below), whose sum is σ = 1409440.
Its totient is φ = 1404540.
The previous prime is 1406983. The next prime is 1407011. The reversal of 1406989 is 9896041.
1406989 = T967 + T968 +
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 a cyclic number.
It is not a de Polignac number, because 1406989 - 27 = 1406861 is a prime.
It is a super-2 number, since 2×14069892 = 3959236092242, 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 (1406983) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154 + ... + 1684.
It is an arithmetic number, because the mean of its divisors is an integer number (352360).
21406989 is an apocalyptic number.
1406989 is the 969-th centered triangular number.
It is an amenable number.
1406989 is a deficient number, since it is larger than the sum of its proper divisors (2451).
1406989 is an equidigital number, since it uses as much as digits as its factorization.
1406989 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2450.
The product of its (nonzero) digits is 15552, while the sum is 37.
The square root of 1406989 is about 1186.1656713967.
The cubic root of 1406989 is about 112.0547404604.
The spelling of 1406989 in words is "one million, four hundred six thousand, nine hundred eighty-nine".