11445989 has 4 divisors (see below), whose sum is σ = 11457420. Its totient is φ = 11434560.

The previous prime is 11445983. The next prime is 11446007. The reversal of 11445989 is 98954411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98954411 = 47 ⋅2105413.

It can be written as a sum of positive squares in 2 ways, for example, as 2505889 + 8940100 = 1583^2 + 2990^2 .

It is a cyclic number.

It is not a de Polignac number, because 11445989 - 2¹² = 11441893 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 (11445983) 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, 4052 + ... + 6269.

It is an arithmetic number, because the mean of its divisors is an integer number (2864355).

Almost surely, 2^11445989 is an apocalyptic number.

It is an amenable number.

11445989 is a deficient number, since it is larger than the sum of its proper divisors (11431).

11445989 is a wasteful number, since it uses less digits than its factorization.

11445989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11430.

The product of its digits is 51840, while the sum is 41.

The square root of 11445989 is about 3383.1921317005. The cubic root of 11445989 is about 225.3639476065.

The spelling of 11445989 in words is "eleven million, four hundred forty-five thousand, nine hundred eighty-nine".