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420392187 = 353746757
BaseRepresentation
bin11001000011101…
…010110011111011
31002022001010200000
4121003222303323
51330110022222
6105414244043
713263163125
oct3103526373
91068033600
10420392187
111a6333966
12b8956623
1369131397
143db92215
1526d909ac
hex190eacfb

420392187 has 24 divisors (see below), whose sum is σ = 646756656. Its totient is φ = 272680992.

The previous prime is 420392173. The next prime is 420392213. The reversal of 420392187 is 781293024.

It is not a de Polignac number, because 420392187 - 24 = 420392171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (420392117) 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 23 ways as a sum of consecutive naturals, for example, 14388 + ... + 32369.

It is an arithmetic number, because the mean of its divisors is an integer number (26948194).

Almost surely, 2420392187 is an apocalyptic number.

420392187 is a deficient number, since it is larger than the sum of its proper divisors (226364469).

420392187 is an equidigital number, since it uses as much as digits as its factorization.

420392187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46809 (or 46797 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 420392187 is about 20503.4676823214. The cubic root of 420392187 is about 749.1202644907.

The spelling of 420392187 in words is "four hundred twenty million, three hundred ninety-two thousand, one hundred eighty-seven".

Divisors: 1 3 9 27 37 81 111 243 333 999 2997 8991 46757 140271 420813 1262439 1730009 3787317 5190027 11361951 15570081 46710243 140130729 420392187