1940686657 has 24 divisors (see below), whose sum is σ = 2528093760. Its totient is φ = 1454656320.

The previous prime is 1940686651. The next prime is 1940686669. The reversal of 1940686657 is 7566860491.

It is not a de Polignac number, because 1940686657 - 2¹¹ = 1940684609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1940686651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20694 + ... + 65647.

It is an arithmetic number, because the mean of its divisors is an integer number (105337240).

Almost surely, 2^1940686657 is an apocalyptic number.

It is an amenable number.

1940686657 is a deficient number, since it is larger than the sum of its proper divisors (587407103).

1940686657 is a wasteful number, since it uses less digits than its factorization.

1940686657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86393 (or 86380 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 52.

The square root of 1940686657 is about 44053.2252735257. The cubic root of 1940686657 is about 1247.3408339066.

The spelling of 1940686657 in words is "one billion, nine hundred forty million, six hundred eighty-six thousand, six hundred fifty-seven".