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2987381 = 11326437
BaseRepresentation
bin1011011001010101110101
312121202220202
423121111311
51231044011
6144010245
734251365
oct13312565
95552822
102987381
111760511
121000985
138079a7
1457a9a5
153e023b
hex2d9575

2987381 has 4 divisors (see below), whose sum is σ = 3013932. Its totient is φ = 2960832.

The previous prime is 2987371. The next prime is 2987407. The reversal of 2987381 is 1837892.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1069156 + 1918225 = 1034^2 + 1385^2 .

It is a cyclic number.

It is not a de Polignac number, because 2987381 - 218 = 2725237 is a prime.

It is a super-2 number, since 2×29873812 = 17848890478322, which contains 22 as substring.

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 (2987371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13106 + ... + 13331.

It is an arithmetic number, because the mean of its divisors is an integer number (753483).

22987381 is an apocalyptic number.

It is an amenable number.

2987381 is a deficient number, since it is larger than the sum of its proper divisors (26551).

2987381 is a wasteful number, since it uses less digits than its factorization.

2987381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26550.

The product of its digits is 24192, while the sum is 38.

The square root of 2987381 is about 1728.4041772687. The cubic root of 2987381 is about 144.0224534175.

The spelling of 2987381 in words is "two million, nine hundred eighty-seven thousand, three hundred eighty-one".

Divisors: 1 113 26437 2987381