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40812781 is a prime number
BaseRepresentation
bin1001101110110…
…0000011101101
32211210111121111
42123230003231
540422002111
64014432021
71003621462
oct233540355
984714544
1040812781
1121046279
1211802611
1385bc799
1455c5669
1538b2a21
hex26ec0ed

40812781 has 2 divisors, whose sum is σ = 40812782. Its totient is φ = 40812780.

The previous prime is 40812727. The next prime is 40812803. The reversal of 40812781 is 18721804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39262756 + 1550025 = 6266^2 + 1245^2 .

It is a cyclic number.

It is not a de Polignac number, because 40812781 - 211 = 40810733 is a prime.

It is a super-2 number, since 2×408127812 = 3331366185907922, which contains 22 as substring.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20406390 + 20406391.

It is an arithmetic number, because the mean of its divisors is an integer number (20406391).

Almost surely, 240812781 is an apocalyptic number.

It is an amenable number.

40812781 is a deficient number, since it is larger than the sum of its proper divisors (1).

40812781 is an equidigital number, since it uses as much as digits as its factorization.

40812781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 40812781 is about 6388.4881623120. The cubic root of 40812781 is about 344.2960680119.

The spelling of 40812781 in words is "forty million, eight hundred twelve thousand, seven hundred eighty-one".