940861781 has 4 divisors (see below), whose sum is σ = 948044064. Its totient is φ = 933679500.

The previous prime is 940861751. The next prime is 940861783. The reversal of 940861781 is 187168049.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 940861781 - 2⁶ = 940861717 is a prime.

It is a super-2 number, since 2×940861781² = 1770441781892983922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (940861783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3590945 + ... + 3591206.

It is an arithmetic number, because the mean of its divisors is an integer number (237011016).

Almost surely, 2^940861781 is an apocalyptic number.

It is an amenable number.

940861781 is a deficient number, since it is larger than the sum of its proper divisors (7182283).

940861781 is a wasteful number, since it uses less digits than its factorization.

940861781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7182282.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 940861781 is about 30673.4703123073. The cubic root of 940861781 is about 979.8853749733.

The spelling of 940861781 in words is "nine hundred forty million, eight hundred sixty-one thousand, seven hundred eighty-one".