1321154840 has 16 divisors (see below), whose sum is σ = 2972598480. Its totient is φ = 528461920.

The previous prime is 1321154789. The next prime is 1321154851. The reversal of 1321154840 is 484511231.

It is a super-2 number, since 2×1321154840² = 3490900222510851200, which contains 22 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 16514396 + ... + 16514475.

It is an arithmetic number, because the mean of its divisors is an integer number (185787405).

Almost surely, 2^1321154840 is an apocalyptic number.

1321154840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321154840 is an abundant number, since it is smaller than the sum of its proper divisors (1651443640).

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

1321154840 is a wasteful number, since it uses less digits than its factorization.

1321154840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33028882 (or 33028878 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 1321154840 is about 36347.6937370172. The cubic root of 1321154840 is about 1097.2811199670.

The spelling of 1321154840 in words is "one billion, three hundred twenty-one million, one hundred fifty-four thousand, eight hundred forty".