1351987 has 16 divisors (see below), whose sum is σ = 1693440. Its totient is φ = 1050912.

The previous prime is 1351981. The next prime is 1351991. The reversal of 1351987 is 7891531.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1351987 - 2³ = 1351979 is a prime.

1351987 is a lucky number.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (1351981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7464 + ... + 7642.

It is an arithmetic number, because the mean of its divisors is an integer number (105840).

2^1351987 is an apocalyptic number.

1351987 is a deficient number, since it is larger than the sum of its proper divisors (341453).

1351987 is a wasteful number, since it uses less digits than its factorization.

1351987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282.

The product of its digits is 7560, while the sum is 34.

The square root of 1351987 is about 1162.7497581165. The cubic root of 1351987 is about 110.5751418638.

The spelling of 1351987 in words is "one million, three hundred fifty-one thousand, nine hundred eighty-seven".