1240771587 has 16 divisors (see below), whose sum is σ = 1808084352. Its totient is φ = 750597120.

The previous prime is 1240771541. The next prime is 1240771619. The reversal of 1240771587 is 7851770421.

It is not a de Polignac number, because 1240771587 - 2¹⁰ = 1240770563 is a prime.

It is a super-2 number, since 2×1240771587² = 3079028262212997138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1240771487) 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, 16318 + ... + 52419.

It is an arithmetic number, because the mean of its divisors is an integer number (113005272).

Almost surely, 2^1240771587 is an apocalyptic number.

1240771587 is a deficient number, since it is larger than the sum of its proper divisors (567312765).

1240771587 is a wasteful number, since it uses less digits than its factorization.

1240771587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69298.

The product of its (nonzero) digits is 109760, while the sum is 42.

The square root of 1240771587 is about 35224.5878187382. The cubic root of 1240771587 is about 1074.5598593333.

The spelling of 1240771587 in words is "one billion, two hundred forty million, seven hundred seventy-one thousand, five hundred eighty-seven".