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40156781 = 723249421
BaseRepresentation
bin1001100100101…
…1111001101101
32210120011202012
42121023321231
540240004111
63552411005
7665220110
oct231137155
983504665
1040156781
1120738425
1211546a65
138420012
145494577
1537d348b
hex264be6d

40156781 has 8 divisors (see below), whose sum is σ = 47889024. Its totient is φ = 32923440.

The previous prime is 40156777. The next prime is 40156783. The reversal of 40156781 is 18765104.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 40156781 - 22 = 40156777 is a prime.

It is a super-2 number, since 2×401567812 = 3225134120563922, 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 (40156783) 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, 124550 + ... + 124871.

It is an arithmetic number, because the mean of its divisors is an integer number (5986128).

Almost surely, 240156781 is an apocalyptic number.

It is an amenable number.

40156781 is a deficient number, since it is larger than the sum of its proper divisors (7732243).

40156781 is a wasteful number, since it uses less digits than its factorization.

40156781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249451.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 40156781 is about 6336.9378251645. The cubic root of 40156781 is about 342.4414263945.

The spelling of 40156781 in words is "forty million, one hundred fifty-six thousand, seven hundred eighty-one".

Divisors: 1 7 23 161 249421 1745947 5736683 40156781