1201989 has 8 divisors (see below), whose sum is σ = 1609920. Its totient is φ = 797696.

The previous prime is 1201969. The next prime is 1201999. The reversal of 1201989 is 9891021.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201989 is a prime.

It is a super-2 number, since 2×1201989² = 2889555112242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201909) 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, 9 + ... + 1550.

It is an arithmetic number, because the mean of its divisors is an integer number (201240).

2^1201989 is an apocalyptic number.

It is an amenable number.

1201989 is a deficient number, since it is larger than the sum of its proper divisors (407931).

1201989 is a wasteful number, since it uses less digits than its factorization.

1201989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 1201989 is about 1096.3525892704. The cubic root of 1201989 is about 106.3245363957.

The spelling of 1201989 in words is "one million, two hundred one thousand, nine hundred eighty-nine".