40020861 has 8 divisors (see below), whose sum is σ = 53479744. Its totient is φ = 26621280.

The previous prime is 40020853. The next prime is 40020913. The reversal of 40020861 is 16802004.

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

It is not a de Polignac number, because 40020861 - 2³ = 40020853 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40022861) 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, 13225 + ... + 15966.

It is an arithmetic number, because the mean of its divisors is an integer number (6684968).

Almost surely, 2^40020861 is an apocalyptic number.

It is an amenable number.

40020861 is a deficient number, since it is larger than the sum of its proper divisors (13458883).

40020861 is a wasteful number, since it uses less digits than its factorization.

40020861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29651.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 40020861 is about 6326.2043122239. The cubic root of 40020861 is about 342.0546320166.

Adding to 40020861 its reverse (16802004), we get a palindrome (56822865).

The spelling of 40020861 in words is "forty million, twenty thousand, eight hundred sixty-one".