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4021991 = 10936899
BaseRepresentation
bin1111010101111011100111
321120100010122
433111323213
52012200431
6222112155
746120631
oct17257347
97510118
104021991
1122a7866
12141b65b
13aaa89c
14769a51
15546a7b
hex3d5ee7

4021991 has 4 divisors (see below), whose sum is σ = 4059000. Its totient is φ = 3984984.

The previous prime is 4021973. The next prime is 4022003. The reversal of 4021991 is 1991204.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-4021991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4021991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18341 + ... + 18558.

It is an arithmetic number, because the mean of its divisors is an integer number (1014750).

Almost surely, 24021991 is an apocalyptic number.

4021991 is a deficient number, since it is larger than the sum of its proper divisors (37009).

4021991 is a wasteful number, since it uses less digits than its factorization.

4021991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37008.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 4021991 is about 2005.4902143865. The cubic root of 4021991 is about 159.0304781836.

The spelling of 4021991 in words is "four million, twenty-one thousand, nine hundred ninety-one".

Divisors: 1 109 36899 4021991