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40001531 = 231739197
BaseRepresentation
bin1001100010010…
…1111111111011
32210021021210012
42120211333323
540220022111
63545212135
7664002353
oct230457773
983237705
1040001531
1120641819
121149104b
13839745b
145453b63
1537a248b
hex2625ffb

40001531 has 4 divisors (see below), whose sum is σ = 41740752. Its totient is φ = 38262312.

The previous prime is 40001519. The next prime is 40001557. The reversal of 40001531 is 13510004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40001531 - 214 = 39985147 is a prime.

It is a super-2 number, since 2×400015312 = 3200244964687922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40001581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 869576 + ... + 869621.

It is an arithmetic number, because the mean of its divisors is an integer number (10435188).

Almost surely, 240001531 is an apocalyptic number.

40001531 is a deficient number, since it is larger than the sum of its proper divisors (1739221).

40001531 is a wasteful number, since it uses less digits than its factorization.

40001531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739220.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 40001531 is about 6324.6763553561. The cubic root of 40001531 is about 341.9995525683. Note that the first 3 decimals are identical.

Adding to 40001531 its reverse (13510004), we get a palindrome (53511535).

The spelling of 40001531 in words is "forty million, one thousand, five hundred thirty-one".

Divisors: 1 23 1739197 40001531