1340220761 has 8 divisors (see below), whose sum is σ = 1512475200. Its totient is φ = 1176369040.

The previous prime is 1340220743. The next prime is 1340220769. The reversal of 1340220761 is 1670220431.

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

It is not a de Polignac number, because 1340220761 - 2¹⁰ = 1340219737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1340220761.

It is not an unprimeable number, because it can be changed into a prime (1340220769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2100341 + ... + 2100978.

It is an arithmetic number, because the mean of its divisors is an integer number (189059400).

Almost surely, 2^1340220761 is an apocalyptic number.

1340220761 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1340220761 is a deficient number, since it is larger than the sum of its proper divisors (172254439).

1340220761 is a wasteful number, since it uses less digits than its factorization.

1340220761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4201359.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 1340220761 is about 36609.0256767372. The cubic root of 1340220761 is about 1102.5343112129.

The spelling of 1340220761 in words is "one billion, three hundred forty million, two hundred twenty thousand, seven hundred sixty-one".