1550743987 has 8 divisors (see below), whose sum is σ = 1672486704. Its totient is φ = 1429351968.

The previous prime is 1550743979. The next prime is 1550743993. The reversal of 1550743987 is 7893470551.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1550743987 - 2³ = 1550743979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1550743987.

It is not an unprimeable number, because it can be changed into a prime (1550743967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78448 + ... + 96205.

It is an arithmetic number, because the mean of its divisors is an integer number (209060838).

Almost surely, 2^1550743987 is an apocalyptic number.

1550743987 is a deficient number, since it is larger than the sum of its proper divisors (121742717).

1550743987 is a wasteful number, since it uses less digits than its factorization.

1550743987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175349.

The product of its (nonzero) digits is 1058400, while the sum is 49.

The square root of 1550743987 is about 39379.4868808622. The cubic root of 1550743987 is about 1157.4796615340.

The spelling of 1550743987 in words is "one billion, five hundred fifty million, seven hundred forty-three thousand, nine hundred eighty-seven".