1555011240 has 32 divisors (see below), whose sum is σ = 4665034080. Its totient is φ = 414669632.

The previous prime is 1555011191. The next prime is 1555011287. The reversal of 1555011240 is 421105551.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1555011240.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6479094 + ... + 6479333.

It is an arithmetic number, because the mean of its divisors is an integer number (145782315).

Almost surely, 2^1555011240 is an apocalyptic number.

1555011240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555011240 is an abundant number, since it is smaller than the sum of its proper divisors (3110022840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1555011240 is a wasteful number, since it uses less digits than its factorization.

1555011240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12958441 (or 12958437 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 1555011240 is about 39433.6308244625. The cubic root of 1555011240 is about 1158.5403857166.

Adding to 1555011240 its reverse (421105551), we get a palindrome (1976116791).

The spelling of 1555011240 in words is "one billion, five hundred fifty-five million, eleven thousand, two hundred forty".